Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a5944c787251a5…

MALICIOUS

PDF

79.1 KB Created: 2021-03-22 15:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f0f3b8550c48de239988f9e6abeb37ea SHA-1: ee4a69de884016da7c630b56b920f824798f4d1b SHA-256: b5a5944c787251a50b5ea53dedf6e0afa6375252b0f15aa3c639bd6c49cef854
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection and ML classification. It contains numerous external links, many pointing to disposable domains and forming a link farm, suggesting a phishing or malware distribution attempt. The presence of malformed streams and suspicious links indicates an exploit or redirection mechanism is likely in use.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/123?utm_term=aditya+full+movies PDF link annotation
    • http://vixitatevejiwo.getenjoyment.net/10784458904.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/tcp_ip_protocol_suite_behrouz_forouzan.pdfIn PDF document text
    • https://fukimeremunosav.weebly.com/uploads/1/3/1/3/131379236/9618786.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/kakuvitevutuzas.pdfIn PDF document text
    • https://rizitutidu.weebly.com/uploads/1/3/1/8/131856545/lizulikag.pdfIn PDF document text
    • http://normaa-id.com/i_too_sing_america_title_meaningh9qkl.pdfIn PDF document text
    • http://idealica-official-it.website/xanajofefobafo0uqj1.pdfIn PDF document text
    • http://suzamakulamuj.mypressonline.com/rukabomafuzamafagagage.pdfIn PDF document text
    • http://blancop.xyz/why_is_my_epson_printer_not_printing_colors1me5l.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/914274528399c5wh.pdfIn PDF document text
    • http://odemebayisitrafik.com/basic_math_facts_assessment_worksheet64r7d.pdfIn PDF document text
    • http://copyright-security-ig.com/add_watermark_adobe_xi7l52d.pdfIn PDF document text
    • https://gisafonenum.weebly.com/uploads/1/3/5/3/135323636/jojadirise.pdfIn PDF document text
    • http://fsfsfd.xyz/jenosuwobk5ow.pdfIn PDF document text
    • https://nadagedo.weebly.com/uploads/1/3/1/8/131858166/91d976c9c7db66c.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/how_fast_can_a_rzr_170_go.pdfIn PDF document text
    • http://chambre.xyz/kumaxekatidojuwupefope174pa.pdfIn PDF document text
    • http://mumopajikex.mygamesonline.org/publication_list.pdfIn PDF document text
    • http://linza.media/how_to_use_aqualink_remoteirldm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_02eb609e98ec415b8dec8036de81e9e4.pdf?index=trueIn PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_cbe6a7d0071248369b0e8aaf52c64a86.pdf?index=trueIn PDF document text
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_13a925e8a52f4b05ae53b0ab4729aae3.pdf?index=trueIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_c6775c7c911645cda2b075845328802b.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_f55bf67eb5b9460ea3c8b3191da792d6.pdf?index=trueIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_c247282109c149c4808f53694b2525cb.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 5108 bytes
SHA-256: 35dc9ec11ca107d3b086ff68adb3fd76fd59a91d701589ecba78211ed0d19267
font_01_sfnt_off00010b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 11196 bytes
SHA-256: d3b32a8179bdef9aae3f68c17916202db9ade6466b7f9fa4fee40fe08047895b