Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec967c377be0b06…

MALICIOUS

PDF

77.0 KB Created: 2021-03-30 19:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f3b5b016e2d73c53d4942b82509210b8 SHA-1: 41ad71aa170e483badccfbb4ca592fed1b3905ef SHA-256: 2ec967c377be0b06e5c91100b71fbf4222c65792aec5421aef47af428528f02a
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains keywords related to psychological tests, likely serving as a lure to drive traffic to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xajibur.ru/123?utm_term=psychological+test+sample+questions+and+answers+pdf PDF link annotation
    • http://kvyovk.xyz/six_principles_of_influence_robert_cialdini_19843m0mb.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/f4febe.pdfIn PDF document text
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/3888444.pdfIn PDF document text
    • https://mixutuxo.weebly.com/uploads/1/3/4/6/134692071/f96724124.pdfIn PDF document text
    • http://parrrtner.xyz/aradhike_song_violin_ringtoneldrt9.pdfIn PDF document text
    • http://italylife.pro/how_to_program_att_remote_to_my_tvt7yk4.pdfIn PDF document text
    • https://zunepijubu.weebly.com/uploads/1/3/3/9/133986973/konajuwop-xaxabofutolu.pdfIn PDF document text
    • https://rasetakewalufil.weebly.com/uploads/1/3/6/0/136086978/savozekuputugiwaged.pdfIn PDF document text
    • https://tatujudipopef.weebly.com/uploads/1/3/4/6/134605081/3493604.pdfIn PDF document text
    • http://mainsale.pro/fumokubows597.pdfIn PDF document text
    • https://zugipevewepa.weebly.com/uploads/1/3/1/4/131483317/xetiwugu_vowep_fuparuvepo_lefavevibe.pdfIn PDF document text
    • https://felinabaf.weebly.com/uploads/1/3/4/3/134380667/0cf0a78ad91979d.pdfIn PDF document text
    • https://dubibezu.weebly.com/uploads/1/3/1/4/131453247/4017453.pdfIn PDF document text
    • http://design-kvartira.info/the_go-giver_summaryxqr8m.pdfIn PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/sunuz.pdfIn PDF document text
    • https://medadafamu.weebly.com/uploads/1/3/0/7/130775854/bidukutawaj_vobogusira_fadinozap_venikisujekup.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/bopuxosavubare/91918321666.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/zegugaseketetufi.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/classical_guitar_strings_reviews.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 5892 bytes
SHA-256: de9dbe5989b7878ff4afe969b53b4fb86845cd3790b11a5cb224d3361b8dd95e
font_01_sfnt_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 10956 bytes
SHA-256: 997cf042d8b147b298ec603fbf8731d535498b74aef8ae83dc5f87e658e1b442

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