Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aecca1d500e300f…

MALICIOUS

PDF

79.6 KB Created: 2021-05-11 12:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: aedc0004c9519b283609151fad23152a SHA-1: 5b63178320628f36387d5fac4927681661ca55bd SHA-256: 9aecca1d500e300f0d1694129f344986616e5604be914356cb64ced5940575da
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=sharp+aquos+quattron+3d+60+inch+tv PDF link annotation
    • http://tizakeguwowil.22web.org/moxevuwakosafifuvudovex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370529/normal_6062ea82434b5.pdfIn PDF document text
    • http://meweremidef.iblogger.org/52788511184.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/hfOjahd/pavaburinuduwajigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479436/normal_6045e31b83390.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/2dMwljb/.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_605116a198e8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375339/normal_5ff1fc5e674d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447258/normal_60521c9b984a6.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/fd8ec6bc-5c14-431e-979c-d4780a821495/how_to_do_a_hard_reset_on_moto_g7_power.pdfIn PDF document text
    • http://wuguwusilabibax.epizy.com/32017026004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa324d8-95e4-4d0a-960b-2d20f3276497/37065563116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f423f9d-3303-4d5b-89e1-b3b504fc9948/47860326781.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_e7499437c5b64451bc6a42514843d52f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b36b5c89-d12b-430b-9917-a9e6a56de799/gumamiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ff8aee5-c429-4209-91af-7946fd0d4bfa/18302727192.pdfIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_1080e179bfb442b1adad5b32096d1bd7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06031c2d-9764-4665-b031-d6f83157607d/childrens_animal_farms_melbourne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e6d5378-cb4a-4014-bc27-b30030ac473d/nordictrack_c2150_dimensions.pdfIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_926168e9d183433682307c95abed7e41.pdf?index=trueIn PDF document text
    • http://tiwobera.rf.gd/bulufukobo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 5880 bytes
SHA-256: 1ec07bc36a15440e5f5fbed91b3aae8080d8be773c1d0923ec7fca074f8dff47
font_01_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 12996 bytes
SHA-256: b41cac8c245bf1a9d9055eaed62f6c3bf2f2d911e3665bfa03a44cc0311eae96
font_02_sfnt_off00011aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA3 16144 bytes
SHA-256: c5b81f703ebddc697e6824868dcd306aba919aa4c1ec28f594a83a04df97872b