Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd9e2b8c3953a73…

MALICIOUS

PDF

76.7 KB Created: 2021-04-05 14:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 28fd4129f316250d1259ea80ef983295 SHA-1: 9ca53ff0b7713dc015dc880d85f32ebcf22ab0af SHA-256: afd9e2b8c3953a73e5c7f1279539df7112b99a9d9ed541982dfa895462287d3c
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a mass of external links, many pointing to disposable hosting, suggesting it's part of an SEO spam or phishing campaign designed to drive traffic to potentially malicious sites. The document body, though heavily obfuscated, references "Macromolecule webquest answer key enzymes", a common lure for educational-themed phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=macromolecule+webquest+answer+key+enzymes PDF link annotation
    • https://cdn.sqhk.co/dutararopat/bhd3Lie/food_truck_pup_cooking_chef.pdfIn PDF document text
    • https://cdn.sqhk.co/sawijewabob/efjgCin/bixutagukile.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/hNidzUT/authentic_tinkle_razors_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/vgergjN/argentine_football_association_afa.pdfIn PDF document text
    • https://cdn.sqhk.co/kipasewimoni/ajeBiiB/63776803748.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/cVifgiW/onstove_epic_7_patch_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/1hcEDge/gipomebapamedujakavas.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/PjexaY5/electronic_music_instruments.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/fixuzisobevomakora.pdfIn PDF document text
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_b9390e29e93f42668802a2cffa4a7b4a.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_ccfe68d4f12d4d648366a120756b1241.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/27697587520.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/arma_3_alpha_mods.pdfIn PDF document text
    • http://fuguzametekobo.myartsonline.com/5445851575.pdfIn PDF document text
    • http://garaben.rf.gd/test_c1_angielski.pdfIn PDF document text
    • http://majezomisi.myartsonline.com/ccna_data_center_arabic.pdfIn PDF document text
    • http://dovikerafiw.rf.gd/coumarin_structure.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/questes_de_administrao_pblica_cespe.pdfIn PDF document text
    • http://datizaxafela.epizy.com/company_relieving_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/tudikosoveketuxazimutive.pdfIn PDF document text
    • https://cbf60184-924b-4e65-abc2-244eb733ec12.filesusr.com/ugd/9a25f9_35af939f7e3e43e28104496e8a0366ff.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 5524 bytes
SHA-256: d9f74d1be041b2ea7fb660f9f26768d89ca3b8467f1c1a63e43e47ccdb73cc90
font_01_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 10988 bytes
SHA-256: b688a1ebb36a50539e2f32958f69c5d632a83085b9f9812aae022f2153f79b42

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