Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d249875f6e19bc8…

MALICIOUS

PDF

81.6 KB Created: 2021-04-22 01:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 963f00cf7a1a0b9a700e2757429c6a75 SHA-1: 0e2ae79dcd6606b418dfe15d376654231fa1cc56 SHA-256: 9d249875f6e19bc82c890dbe578be639dd95f9d294ec1bd0cb64eda757100211
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high probability of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to manipulate search engine results or distribute further malicious content. The presence of 'utm_term' parameters in some URLs further supports the idea of tracking or redirection for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jottigo.ru/strik?utm_term=boots+on+the+origins+of+pcs+pdf PDF link annotation
    • http://fapasevusiledap.mygamesonline.org/agile_software_development_martin_download.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/cards_against_humanity_cards.pdfIn PDF document text
    • https://bisobozewex.weebly.com/uploads/1/3/0/9/130969373/laxorezorafepos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_6056b0684b1d5.pdfIn PDF document text
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/kunareb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446512/normal_602b4f2a46f43.pdfIn PDF document text
    • http://pshcomonhere.xyz/alarm_app_android_10glzpu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385038/normal_604f70b6a51e8.pdfIn PDF document text
    • http://ctuxuu.com/american_assassin_movie_summaryqb2eu.pdfIn PDF document text
    • https://kopepadozuko.weebly.com/uploads/1/3/4/5/134505487/vawofomise_wewimune.pdfIn PDF document text
    • http://zoomita.fun/361030735896dhr0.pdfIn PDF document text
    • https://tiwedipetubed.weebly.com/uploads/1/3/2/8/132816066/75cab8e.pdfIn PDF document text
    • http://hookup754.fun/how_to_replace_whirlpool_stove_knobsszcgf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427514/normal_6057bfe705bb1.pdfIn PDF document text
    • http://esclick.pro/how_do_you_reboot_a_verizon_fios_router72z16.pdfIn PDF document text
    • http://zumufufup.sportsontheweb.net/zudaxed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372719/normal_5fefd4dd39738.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e0e7763-e475-47bd-bc95-8d32bb37090f/figiwew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cc85a72-d661-48d5-b994-3bb55fcb823f/pazazivesarutopodo.pdfIn PDF document text
    • http://noratev.myartsonline.com/87570532847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b31d3ce-e7d9-4cd6-9ad9-330cdd7b7701/neato_botvac_connected_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063c7351-e92b-4b7f-a7a0-57fb622cc996/blue_iris_linux_wine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca8b7fe8-2282-46c8-9995-45073811d686/mirirebupanenukosigig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/163a0854-e3e3-40d3-9c07-c827f59a68af/45173597113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f5b014b-4c62-4bf5-945b-9094362175b5/67265613215.pdfIn 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_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 3180 bytes
SHA-256: 089bea227a91d062eb6736ac378f246db37830e8495bb6c4f0dec75d159b1265
font_01_sfnt_off000100bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 5224 bytes
SHA-256: 86719d242d0c7c0be593f8f8233a4fd83ec2c243ee0479cd1b0e3a11ca119d3a
font_02_sfnt_off0001128c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128C 11148 bytes
SHA-256: b7c68f3334bc29e502347b08b95994fe370907d40e7b9aa8d5fc5f43721b68bc