Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a332691b35d56d…

MALICIOUS

PDF

66.7 KB Created: 2021-03-03 08:27:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f35826944b8f23acc42fc569155be714 SHA-1: 66dea05fdd921b1db8d804242567dd66bcb891f4 SHA-256: 78a332691b35d56d8ad1b7e602619ea7412aa7e3a4d02f6bec7705fb45fab13f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://mezovuduw.ru/wix?keyword=interior+and+exterior+angles+worksheet+answer+key PDF link annotation
    • https://dexanobibe.weebly.com/uploads/1/3/5/2/135299911/wotejujomuzezeji.pdfIn PDF document text
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/3666071.pdfIn PDF document text
    • http://metalllift.ru/sapobur423mm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480891/normal_603b933744bdb.pdfIn PDF document text
    • http://fabermanufacture.ru/394942613581q9wq.pdfIn PDF document text
    • http://stassikorskyi.com/3480256475gf8ux.pdfIn PDF document text
    • http://xakidofe.sportsontheweb.net/how_to_put_beats_solo_2_wireless_in_pairing_mode.pdfIn PDF document text
    • http://prodson.fun/plato_republic_translated_by_g.m.a._grube5v426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427093/normal_601a33e8cafbd.pdfIn PDF document text
    • http://bupro.asia/boxosimejifg9xk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaxatuparogojix.epizy.com/97547287327.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/heidi_cartoon_movie_english_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86C 5348 bytes
SHA-256: bc7bfa3f9ccdce132a524611cee7f4f75d631ccb9502063619b3c5b613e6f769
font_01_sfnt_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 10328 bytes
SHA-256: 4598f5475b5b1947436838c18c3f31fbbfa924c3d565e3eb9aa17a296bc30e56

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