Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a865a0e414d6e32…

MALICIOUS

PDF

74.6 KB Created: 2021-04-06 21:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4144c23105907902563c13f9d2cd685 SHA-1: 7bcafc18874c8889f1c7dc33d295c89a41cfaea0 SHA-256: 0a865a0e414d6e32dcd6b1fad9ad8267d6f8b9ee48c707d4e9b65df2c3756733
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing sites, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=brainpop+natural+selection+worksheet+answer+key
    • https://zetitazafoxiz.weebly.com/uploads/1/3/4/0/134040412/444963.pdf
    • https://sopazavevorud.weebly.com/uploads/1/3/4/3/134370644/a432d975a.pdf
    • https://dewixazupeteti.weebly.com/uploads/1/3/1/4/131455636/5777951.pdf
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/9591268feb3d.pdf
    • https://zutiwijutorezaz.weebly.com/uploads/1/3/4/3/134354078/d18e4e8.pdf
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/fobidas-zipixi.pdf
    • https://gejomomik.weebly.com/uploads/1/3/4/7/134719116/fawonilasurepemepot.pdf
    • http://tudetiva.iblogger.org/water_booster_pump.pdf
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/fobafawixi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://letituxis.epizy.com/64045964575.pdf
    • https://s3.amazonaws.com/sigobija/wuvuvixokita.pdf
    • http://xidozuk.rf.gd/epayroll_tamilnadu.pdf
    • http://remigesej.epizy.com/asus_crosshair_vi_hero_bios_update_guide.pdf
    • http://naxepatixotilu.rf.gd/business_plan_for_startup_software_company.pdf
    • https://s3.amazonaws.com/muvazi/warhammer_40k_book_chronology.pdf
    • https://s3.amazonaws.com/bulalowisu/25871379673.pdf
    • http://kizifisen.rf.gd/72529609281.pdf
    • https://s3.amazonaws.com/dutimajizowa/47639493444.pdf
    • https://s3.amazonaws.com/xiwevitox/pals_virginia_beach_public_schools.pdf
    • https://s3.amazonaws.com/fajetufekejo/kindergarten_color_worksheets_printable.pdf
    • https://s3.amazonaws.com/jazuravazaguz/amazon_fire_8_user_manual.pdf
    • https://s3.amazonaws.com/fipijife/razularibenotugetu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e48b.bin
3921926fedc0bff56935ab0ddaeec77e68c190dd09ac15a291ae83fba2e3976b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 5328 bytes
font_01_sfnt_off0000f6ba.bin
c08c94796ad71ee68e9c6a6d4578fd85bc305938878b9729192f727bbfcf292a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 11092 bytes

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