Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf715b62f272215…

MALICIOUS

PDF

72.5 KB Created: 2021-01-24 05:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3fac8d4e961e721e611cde6be1f1c860 SHA-1: 9ef136c596408b179313ab47a73dc44182202ffa SHA-256: 9bf715b62f27221599e018488c43f7d9e15f4aba1279f2eac91988598e127230
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One prominent URL, 'https://trafftec.ru/123?utm_term=a+cup+of+tea+katherine+mansfield+summary', is flagged as an image lure linking to an SEO redirector. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest a malicious intent, likely related to phishing or SEO abuse, and ClamAV detection confirms its malicious nature.

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://trafftec.ru/123?utm_term=a+cup+of+tea+katherine+mansfield+summary PDF link annotation
    • https://site-1168052.mozfiles.com/files/1168052/dwight_yoakam_suspicious_minds.pdfIn PDF document text
    • https://wiwanozamo.weebly.com/uploads/1/3/4/3/134306351/3490216.pdfIn PDF document text
    • https://site-1173264.mozfiles.com/files/1173264/fofedudixitix.pdfIn PDF document text
    • https://gefedotozowane.weebly.com/uploads/1/3/4/3/134395864/9556524.pdfIn PDF document text
    • https://site-1176376.mozfiles.com/files/1176376/open_houses_today_blaine_mn.pdfIn PDF document text
    • http://xodikiz.iblogger.org/cnidarian_diversity_polyps_worksheet_answers.pdfIn PDF document text
    • https://raduwefun.weebly.com/uploads/1/3/1/1/131164260/misowugebelirevijolo.pdfIn PDF document text
    • https://site-1172117.mozfiles.com/files/1172117/movie_hd_app_apk_for_android_tv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xenuduximowub.epizy.com/internet_manager_6._32_kuyhaa.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/wonder_full_movie_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/figufukogigezijuved.pdfIn PDF document text
    • http://tijoduv.epizy.com/amusement_park_vocabulary_worksheets.pdfIn PDF document text
    • http://vubimefiz.epizy.com/72505758221.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/classic_media_player_portable.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/canopy_growth_q3_earnings_report.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_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 5552 bytes
SHA-256: 50c22223b0fd2e6bd2f69a06de2972a6ddf32730fc7e0917f82b36c4f0ba7d8c
font_01_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 10676 bytes
SHA-256: 91243a050765d2ecee7e850a2f9b6f9ae538b5349d71d53b2c0fec2d6ec1d519

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