Malicious PDF — malware analysis report

Static analysis result for SHA-256 798a6d3897048e62…

MALICIOUS

PDF

77.7 KB Created: 2021-04-24 22:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0fb8bf0efbc99608fcbe8ebfeff63a50 SHA-1: d13f3f09e8dbe4b45d9e43c2ced72891186c7fe4 SHA-256: 798a6d3897048e6271be68885d0c6272f551684f057688c81706d6264ea0815e
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users to other sites. The primary redirector URL is 'https://golowaki.ru/strik?utm_term=better+than+before+gretchen+rubin+pdf+free', which is presented as a free download lure. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://golowaki.ru/strik?utm_term=better+than+before+gretchen+rubin+pdf+free PDF link annotation
    • https://matisosu.weebly.com/uploads/1/3/2/6/132681513/7324579.pdfIn PDF document text
    • http://zusagukitu.mywebcommunity.org/wing_chun_compendium_free_download.pdfIn PDF document text
    • https://turabebusaweni.weebly.com/uploads/1/3/1/4/131438207/3161044.pdfIn PDF document text
    • https://bimipesetasezi.weebly.com/uploads/1/3/4/0/134017520/vulak.pdfIn PDF document text
    • https://lanuwoga.weebly.com/uploads/1/3/1/6/131637333/ff9562.pdfIn PDF document text
    • http://sewukagazub.mypressonline.com/breakthrough_plus_1_2nd_edition.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/zuniverijesud/ben_10_ultimate_alien_episodes.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/casuarina_primary_school_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/measure_theory_exercises_and_solutions.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_f788ba3bf1754812bface64742c83c28.pdf?index=trueIn PDF document text
    • https://8df9d1b7-8f6e-49e1-bdac-c9da4d4291fd.filesusr.com/ugd/12c198_ff97bbbcd145428098e1b5c7f88e286e.pdf?index=trueIn PDF document text
    • http://dibalata.epizy.com/habibie_factor.pdfIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_8dd2b80a51c24ad0bd2e18860f37c673.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/41486549209.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/saxeroz.pdfIn PDF document text
    • http://tobidogajetu.onlinewebshop.net/adverbial_clauses_of_purpose_exercises.pdfIn PDF document text
    • http://gimusatis.rf.gd/31869111634.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/52011675902.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_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 5396 bytes
SHA-256: 8c2528036a81f6d4385cb62980e0c251213a75bfab4ef834da6038ca6d9b6d06
font_01_sfnt_off0001045f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045F 10816 bytes
SHA-256: 1426a3d20ca6f34bd5b7694eea0d40c824a6779e0da14ff734966428620ca947

Open this report in the interactive analyzer, or submit your own file for analysis.