Malicious PDF — malware analysis report

Static analysis result for SHA-256 632c67cc72561233…

MALICIOUS

PDF

75.0 KB Created: 2021-02-05 17:27:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 323f4ac3bf8adf51a9e18c5037653d1f SHA-1: 395ae6a743b463793c48c63597bbc25ed6aa338d SHA-256: 632c67cc72561233a3f68e47b17ecd099ddcfb0ab57f8259c15c8bbc7968022d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to other PDF files hosted on disposable domains, suggesting a link farm or SEO abuse tactic. The presence of numerous external URIs and the overall structure strongly indicate an attempt to redirect users to potentially harmful content or facilitate further distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/aws?utm_term=celebrity+pink+jeans+size+guide PDF link annotation
    • https://cdn.sqhk.co/nerutamar/iZhjbgd/crossword_heaven_solvers.pdfIn PDF document text
    • http://ekzo-fruit.ru/download_movie_sub_indor3mk5.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/sjbtBB4/jogupivapevobixiwa.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/jWjarii/slice_of_life_anime_movies_netflix.pdfIn PDF document text
    • https://xobijuveja.weebly.com/uploads/1/3/1/6/131606615/3392019.pdfIn PDF document text
    • http://videohost.space/fudugesob5z5m3.pdfIn PDF document text
    • http://yogist.fun/ejercicios_de_multiplicacion_y_division_para_imprimirxo8bq.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/gjdRiau/electrical_pre_apprenticeship_program_near_me.pdfIn PDF document text
    • https://kowezuvive.weebly.com/uploads/1/3/4/6/134603832/xifojogeninuluxisu.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/jhiiSWQ/xunosurijepir.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/Sm6ideh/xixasosumodovo.pdfIn PDF document text
    • http://photoforce.ru/bagaliwawinasiltv76e.pdfIn PDF document text
    • http://simkosa.website/tetris_ultimate_ps4z9fle.pdfIn PDF document text
    • http://ujjjrrrrr.space/zabozubitojolosiripa0trri.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/takXjas/fanivapek.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
    • http://kifugelewepin.epizy.com/1295936018.pdfIn PDF document text
    • http://diwuzenebixo.epizy.com/spelling_bee_words_for_grade_2.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_off0000da15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA15 5356 bytes
SHA-256: 2f7eda8b4b280b480b9afac7310642b166911ffb4eaee0ed2c0b23a82eadddf0
font_01_sfnt_off0000ec59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 10736 bytes
SHA-256: c08ee1e298c5ef3a91d504b73dd1bacf97b1a42ff49612af261b82085e514f43
font_02_sfnt_off000110c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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