Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4f95b449c9237d…

MALICIOUS

PDF

80.3 KB Created: 2021-02-17 15:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3d92d1a80df99ae25549f4b0c8d1bfe3 SHA-1: 402988524b10f0295614853dae7d26a56a255933 SHA-256: 3c4f95b449c9237d434b7a5c4f28fe8cb4a77dd7ec7576bc3a85c6470b7cf997
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://yafferge.ru/strik?utm_term=battery+tender+jump+starter+600+amp'. This URL is likely part of a phishing campaign designed to trick users into clicking through to a malicious site. The presence of numerous other PDF links, many pointing to S3 buckets, suggests a link farm or SEO poisoning attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=battery+tender+jump+starter+600+amp In PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/0da8aace9.pdfIn PDF document text
    • https://dawudetunik.weebly.com/uploads/1/3/5/9/135972975/berosudetasi-tixozexus.pdfIn PDF document text
    • https://bupiwuzisulim.weebly.com/uploads/1/3/0/8/130874125/moxados.pdfIn PDF document text
    • http://sowufevoga.iblogger.org/alodine_1201_msds.pdfIn PDF document text
    • https://goguribepolim.weebly.com/uploads/1/3/0/7/130739596/eafa36eb8239f.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
    • https://s3.amazonaws.com/safenalavojuwu/cadillac_ats_v6_manual.pdfIn PDF document text
    • http://lekodabiwizu.epizy.com/android_sdk_manager_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/sql_server_2017_licensing_guide_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/yahoo_weather_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/abdominal_tuberculosis_treatment_guidelines.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/86623150504.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/brattleboro_reformer_sports.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/how_to_review_a_medical_journal_article.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/icsee_user_manual.pdfIn PDF document text
    • http://nejovafejasujob.rf.gd/the_longest_ride_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/enhancement_shaman_classic_gear_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/xepewunajatojexor.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/17355384974.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/wurutupibogowod.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/star_ocean_anamnesis_apk.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_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 5320 bytes
SHA-256: e9ca98a30bcd562151baae8943fba659f7c4080a98af4dae95480b7018106862
font_01_sfnt_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 10816 bytes
SHA-256: b17e7947bd4dcefd6b344bd557edc7f373a7dd200e094b7492779273ea0eeda1
font_02_sfnt_off0001254e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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