Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b87c0629fcffb0d…

MALICIOUS

PDF

85.3 KB Created: 2021-03-17 17:26:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3428def1886731f57108cfa06212ffb7 SHA-1: b8ea37c089f8c638eb3f5948cbda38e970aff963 SHA-256: 5b87c0629fcffb0d13bc3a402b6ecc33c7eecdaae4d5963048e4901373bc7f6e
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to potentially malicious or phishing sites. The ML classifier and ClamAV also identified it as malicious. While no scripts were explicitly extracted, the structure suggests it's designed to lure users to external content, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=the+stranger+albert+camus+character+analysis PDF link annotation
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/zibimozajotidowegabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_6030abcb9a5e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417123/normal_601a1c417027a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447270/normal_5fe41ed90ce27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_5fd1216e98f7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486054/normal_60501f3b1d5f5.pdfIn PDF document text
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/litasot_vuvatuwepotul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413467/normal_5fed29681e20f.pdfIn PDF document text
    • https://miremawa.weebly.com/uploads/1/3/4/6/134631892/3204983.pdfIn PDF document text
    • https://bijejumutitin.weebly.com/uploads/1/3/1/4/131454352/buliwebu-lojipezuwopek-falogovutiper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370541/normal_602e9f636b16e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370056/normal_5fcbf9fc098a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480728/normal_603f1082a9f6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fujifumava.epizy.com/futefikomuluvekujixurive.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/23422838154.pdfIn PDF document text
    • http://ximawefab.epizy.com/dominating_sword_immortal_novela_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/fobopobutuzimagidowofot.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/80588107803.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_off0000fc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 5404 bytes
SHA-256: 96c1fed0623ebfade6a35fe8ccf30afb5617667c2a4320f90e6ae0c45ce4c12d
font_01_sfnt_off00010eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB4 10684 bytes
SHA-256: c2f9311d02c8bb6ef4f6e1873491ff45c40604ea999a7adb5efce3c572270727
font_02_sfnt_off000132a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A2 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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