Malicious PDF — malware analysis report

Static analysis result for SHA-256 8287defc9f650fc4…

MALICIOUS

PDF

80.4 KB Created: 2021-04-06 02:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: de49c30541f7f234a15ef73163d41c73 SHA-1: 0754ecef6991bc60da8760bb6749680dd5519056 SHA-256: 8287defc9f650fc4c0298948115424954c3404ccdafbe3db38514379b081688a
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious redirection scheme.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=vector+addition+sample+problems+with+solutions+pdf In PDF document text
    • https://mobisikude.weebly.com/uploads/1/3/1/6/131606420/tetegitazap.pdfIn PDF document text
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/tozodipuxo.pdfIn PDF document text
    • http://lifeit.pro/long_john_silver_coupons_november_2019vlxf5.pdfIn PDF document text
    • https://gupijevud.weebly.com/uploads/1/3/1/4/131407369/xamavinidatom-zesivez-kolixubarite.pdfIn PDF document text
    • http://qunit.space/does_samsung_55_inch_smart_tv_have_bluetootht1wz6.pdfIn PDF document text
    • http://tiktokfrance.fun/19286624631hv532.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/4047826.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/94303600925ovzby.pdfIn PDF document text
    • https://bupuzufemu.weebly.com/uploads/1/3/1/4/131452870/fubagumebap.pdfIn PDF document text
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/460719b117015d.pdfIn PDF document text
    • https://dexugagemer.weebly.com/uploads/1/3/4/7/134715037/2462962.pdfIn PDF document text
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/lukomaruz-rivixu-patamezaviro-bedowobonon.pdfIn PDF document text
    • https://judorobizud.weebly.com/uploads/1/3/4/4/134455398/c1ebe8b2c.pdfIn PDF document text
    • https://lonokowikur.weebly.com/uploads/1/3/5/3/135384913/natovofipijulalopo.pdfIn PDF document text
    • http://trickyturkey.com/vewevovadodipilebuuiiww.pdfIn PDF document text
    • https://nefositasin.weebly.com/uploads/1/3/4/3/134310380/5fc62c70566b90.pdfIn PDF document text
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/2852439.pdfIn PDF document text
    • http://xupevagadozojad.22web.org/77988518380.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://s3.amazonaws.com/satudifin/who_was_cs_lewis_brother.pdfIn PDF document text
    • http://xelepidozagetof.epizy.com/durufumoporeseluwuv.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/22826823898.pdfIn PDF document text
    • http://bujepefu.epizy.com/is_free_sat_good.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_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 5472 bytes
SHA-256: f8c847a761a34057118692f3b792ce3031af9e730595202f5441356bd5d32039
font_01_sfnt_off0000fe2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 11548 bytes
SHA-256: d48896a6910b7a7dc1eb7f19deb2d23519bd3bb8378d065371158190c4678bd1
font_02_sfnt_off000125b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176