Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8c665bf600b606…

MALICIOUS

PDF

68.0 KB Created: 2021-02-11 14:46:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 1fc6af2c0943b68062edc3ed99bfa5d6 SHA-1: 34ab644846883ff78d2b7a2861a5b9bcafc94bba SHA-256: fb8c665bf600b6060afa36ebcbe3bc5371ad8d2c2e29daa83e899915c74db65d
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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/wix?keyword=redwall+series+pdf+download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4499958/normal_5fc9d07525022.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474176/normal_5fc7642a54e15.pdfIn PDF document text
    • https://cdn.sqhk.co/kobedobofepo/eahaicg/mobile_security_antivirus_trend_micro.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvifilezaja/jihdSgf/wusejafilezor.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/bDnpIfj/78536187965.pdfIn PDF document text
    • https://gabodubelekopo.weebly.com/uploads/1/3/4/3/134356924/081578a292e9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482860/normal_5fec918644b82.pdfIn PDF document text
    • https://vavaterojitenoj.weebly.com/uploads/1/3/4/8/134898986/1671219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_5fe6fdeab6d8a.pdfIn PDF document text
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/3c8d71e4a16.pdfIn PDF document text
    • http://viewcreditscore.info/459886942324uh52.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/jeworurowam/fractions_worksheets_math_drills.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/74220912991.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/xigozubuwutaxejajosipu.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/panogipajutopitize.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/counter_strike_source_maps.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/hitman_blood_money_google_drive.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/yiruma_reminiscent_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/6437515261.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/convert_string_to_int_c_format.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_off0000cd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8B 5136 bytes
SHA-256: 8888cf9e08413bddd7cb9f08c91fc71b214b9711560af42e4ddd09cd1b4a07a2
font_01_sfnt_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 10360 bytes
SHA-256: 877c33acac808aeb4e948ef27ef898744ec2adae0b17b376c3d0130a72995e1e

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