Malicious PDF — malware analysis report

Static analysis result for SHA-256 10bf94a20999e53d…

MALICIOUS

PDF

72.9 KB Created: 2021-03-25 23:14:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b35400933d8dc5e1549ddccca71cdbbd SHA-1: b2b0d7aacf1ba27f4476c8ca32aeb4767eca56c9 SHA-256: 10bf94a20999e53dbd77879f786cd81abf22926769cfe10d339cfe9e1a8ec5a7
196 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, including ClamAV's Pdf.Phishing.Trojan detection. It employs a link farm strategy, embedding numerous external links to PDF files hosted on various domains, likely as part of a phishing or malware distribution scheme. The primary lure appears to be a fake "Reader's Digest sewing book PDF", directing users to SEO-optimized redirector URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jacksth.ru/123?utm_term=reader%2527+s+digest+sewing+book+pdf PDF link annotation
    • https://takibuvekinapix.weebly.com/uploads/1/3/4/4/134456834/muvewivokagulibixexi.pdfIn PDF document text
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/boporafom.pdfIn PDF document text
    • https://xezelugewopisaw.weebly.com/uploads/1/3/5/3/135311865/e0b009.pdfIn PDF document text
    • https://ruzesemuzonasow.weebly.com/uploads/1/3/4/0/134017575/zivalulivu-vupoj-bojexeruki-manovot.pdfIn PDF document text
    • http://fruit-ita.fun/smart_home_base_2_blinkt_grun_weiz02pq.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/ad70shc/pagevegugilizanewejagupir.pdfIn PDF document text
    • https://dozunetad.weebly.com/uploads/1/3/4/4/134472758/pitufepoxajolider.pdfIn PDF document text
    • https://cdn.sqhk.co/lenubire/hhB3Aic/bovesatobejanotajelabiruv.pdfIn PDF document text
    • http://sibuvre.com/what_is_the_translation_of_nessun_dormadwmac.pdfIn PDF document text
    • https://fudegenajeno.weebly.com/uploads/1/3/4/5/134581691/vebejopiraves-pakerixo.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/igcjghh/island_village_apartments.pdfIn PDF document text
    • https://zupipozove.weebly.com/uploads/1/3/4/5/134589893/pejoritabajo.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/gddggji/pizozigapazo.pdfIn PDF document text
    • https://bibatajikoxego.weebly.com/uploads/1/3/5/3/135315017/97551.pdfIn PDF document text
    • https://waporutonopira.weebly.com/uploads/1/3/1/4/131438234/bbc9c2f85422.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/fotojipifuzitul/ayyappan_dj_songs_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/zogivosu.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/didajojumezifosijowi.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/cholesteatoma_treatment_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d86f72-5f7a-45a6-96d2-d7eba68318b5/65652514088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c16f045-e4ce-42c6-ae66-3b53d8689a4b/bob_stroller_car_seat_adapter_for_evenflo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b207ed02-a591-47c0-9545-9ac8df4e1ee9/68992762189.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/audio_visualizer_video_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2c57d2c-d063-4319-a2e9-06b2cf49cd96/how_can_you_prove_that_sunlight_is_necessary_for_photosynthesis_lab_activity.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_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 5300 bytes
SHA-256: 2c969f407a4125d4baf28dcab247f23e87164ad5fdc3d95cde8fb63f80b223f1
font_01_sfnt_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 10256 bytes
SHA-256: b4fb579a21a161f38d598d5cdec873ba5236cb867cabf7cfdaa09aa5cab94992
font_02_sfnt_off000107d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2