Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d8a8c5dcd848c5…

MALICIOUS

PDF

80.9 KB Created: 2021-04-24 03:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 00b6e73c49a3176c326d0b9f7d70daac SHA-1: d1a932c61ebf9d96580c45dd8617e320df2d9aa7 SHA-256: d9d8a8c5dcd848c53b412167ef71e84a65f2d101a1426d830495591733b6c8dc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and a link farm heuristic strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=warlock+multiclass+5e+spell+slots PDF link annotation
    • http://proita.fun/2515257716348jul.pdfIn PDF document text
    • http://creditinquiry.info/what_do_stained_teeth_meanzct2u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446914/normal_60526e28385cb.pdfIn PDF document text
    • http://sokfresh.fun/power_cooker_plus_canning_instructionsk1rdp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422144/normal_5fc74db5d55b7.pdfIn PDF document text
    • http://domavera.ru/zaxokewujixuwawixeginvs9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_6013a6765fcea.pdfIn PDF document text
    • https://lutigasudubuwa.weebly.com/uploads/1/3/2/6/132695203/4551876.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/xedigo_voxulawut_vipenoxigada.pdfIn PDF document text
    • http://mebets.xyz/torebosufag1yexg.pdfIn PDF document text
    • http://stebsmeh.space/android_watch_phonedmlf4.pdfIn PDF document text
    • http://wekeb.space/how_to_access_wd_my_cloud_storagek2imc.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/faverimuzevezimub.pdfIn PDF document text
    • https://genebametujo.weebly.com/uploads/1/3/4/9/134904617/ad6fb77ec.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/e6add31df2d1.pdfIn PDF document text
    • http://fruitslope.online/kesimigalipesabqkfkr.pdfIn PDF document text
    • http://idealica-ordina.site/wordscapes_in_bloom_daily_puzzle_october_7_2020x3bb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387056/normal_6006f95424fbe.pdfIn PDF document text
    • http://polnews.xyz/28550856128lm0p6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_008d22e0dad44010bea593de23c96286.pdf?index=trueIn PDF document text
    • https://3df016ad-b40f-424f-9918-b96c60f46212.filesusr.com/ugd/387bfe_c3a61d2bb273462ba90085aabbf15908.pdf?index=trueIn PDF document text
    • https://320f262d-053d-461a-9009-498fa3b044f5.filesusr.com/ugd/8e680a_1a6eb2ca93374edeb91580a4e69d1c4f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 5056 bytes
SHA-256: a3b6c7d8169a378f81a4ac7bb5f8383d0a58dd735c4a9104fbe1891f17d830e9
font_01_sfnt_off0001035d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035D 10704 bytes
SHA-256: 841ae93ecd4077869363800d8ccedc3ae8642a6dab0d49eba5f2e301dbcb0baf
font_02_sfnt_off000127e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E0 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f