Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2add85f4eda362e…

MALICIOUS

PDF

79.4 KB Created: 2021-05-12 06:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: aa463f5178cae6df2a9d01145e659293 SHA-1: 0e791990e832884850cd55182e87cd2ee37d5e6d SHA-256: b2add85f4eda362ef16eac2cd6cdf70b5a5ebc9dfc5535f8a5d74a383c8a1b9f
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a lure related to a 'Dell laptop battery not charging' issue, which is a common tactic for phishing or scam attempts. It includes numerous external links, with a primary redirector URL pointing to 'mezovuvuw.ru'. The presence of a large number of external links, including a 'link farm', suggests an attempt to manipulate search engine results or direct users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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://mezovuduw.ru/strik?utm_term=dell+laptop+battery+not+charging+more+than+60 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401555/normal_60551e33ae3eb.pdfIn PDF document text
    • https://kazowutulegopos.weebly.com/uploads/1/3/5/3/135324393/3381528.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/nakawenomosinefivazale.pdfIn PDF document text
    • http://bijowuxupolapi.sportsontheweb.net/nipisomamivuduzi.pdfIn PDF document text
    • https://lidutefavova.weebly.com/uploads/1/3/4/0/134012516/nubowomevil-mitemere-ruwigafewolegi-zezomep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478683/normal_60329be0d6d57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425224/normal_6020899c525cc.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/83950889202.pdfIn PDF document text
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/goxedodola-gapewi-xumuneke-xejonigimulukot.pdfIn PDF document text
    • http://moradudipomibo.mypressonline.com/93118793246.pdfIn PDF document text
    • https://wumifidadorubip.weebly.com/uploads/1/3/5/2/135298964/3f8deaa3e601ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491926/normal_60186b96d9fe5.pdfIn PDF document text
    • https://poxofosu.weebly.com/uploads/1/3/4/3/134308827/nagemineraderabevid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410443/normal_606db9440ce7d.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/lekizopiloref/52646046125.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/aarti_sangrah_audio_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d15e338-f732-4794-a920-b6c066b850a3/ponexosobure.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/85482468448.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/xakepewuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a39ac645-0f3e-459e-a3b4-eed9f548d894/zizejaravuja.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/51063466904.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/xowixu.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/ragnarok_idle_poring_thief_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/gufade.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/how_do_i_find_aa_meetings_in_my_area.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06661987-bf4a-4164-9db4-64d0fa5aaf00/vurakatubegemilulub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c424ae88-c962-471d-96f6-4dcc0c5d730f/94182957492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a3c6f7-9e8d-4ad7-b32d-e8ba3bf3dad7/werewolf_board_game_cards.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_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 5708 bytes
SHA-256: a726ba10746d0cfc29da3d3367a57c4ccca539315fa9cd864d6376d3447e0fbe
font_01_sfnt_off00010bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB6 10528 bytes
SHA-256: 7b23aecdc4be68b1b381c9c193af38767b6bf11c32f670f3844c45e8801c83c1

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