Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3848f4032d380ab…

MALICIOUS

PDF

88.0 KB Created: 2021-03-15 23:50:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3c2bb01c309b8e6b85a230787f95a2e7 SHA-1: d25446ede6fb119164a7c4c8caa90fb162735bef SHA-256: e3848f4032d380ab6cda9893be9f79cc236edd8b254f113855bb83e55b540e3a
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF files, and one prominent link disguised as a manual. This indicates a likely SEO spam or phishing campaign aiming to drive traffic to malicious or deceptive websites. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/wix?keyword=skip+hop+exersaucer+manual PDF link annotation
    • https://suzavopuwo.weebly.com/uploads/1/3/4/6/134686694/91e21ea3cdf3f00.pdfIn PDF document text
    • http://moymagazin.xyz/rotutov23cqr.pdfIn PDF document text
    • https://jenodaxadow.weebly.com/uploads/1/3/4/0/134012655/wutawuserof.pdfIn PDF document text
    • http://worldthailand.fun/xotiwo68sv0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401692/normal_60277c0276e41.pdfIn PDF document text
    • https://kekoweditolig.weebly.com/uploads/1/3/2/6/132683085/3060584.pdfIn PDF document text
    • http://veronaital.space/how_to_change_battery_in_armitron_pro_sport_watchg8v8v.pdfIn PDF document text
    • https://dilaxizinis.weebly.com/uploads/1/3/5/9/135973905/zuvoxamomegowiw.pdfIn PDF document text
    • https://mikofamix.weebly.com/uploads/1/3/4/8/134882663/gajetasab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378834/normal_5fca83b78a114.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365584/normal_5ffd0c3a231bd.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/exercice_quadrilatre_cm1duha7.pdfIn PDF document text
    • http://fashion-deals.xyz/quick_installation_guide_wireless-n_repeater_router_aphafsz.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/vufupu/afmc_exam_application_form_2019.pdfIn PDF document text
    • http://xufoziminep.onlinewebshop.net/sirinuwefatogebidutobi.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/26679758964.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/nivivinosabororulugaw.pdfIn PDF document text
    • http://bibezakomi.myartsonline.com/busupagorikuvasosodonoliz.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/what_are_some_non_verbal_communication_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/que_significa_pagano_segun_la_biblia.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/safozez.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_off0001171a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171A 5408 bytes
SHA-256: 971e560a98f9d653cee7b3ba7cd44fea210ba0ba116196eaa90808f6c13c2505
font_01_sfnt_off00012959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12959 11968 bytes
SHA-256: 36620bbbeb3500f2b396b63a863bc8e6ec2e785df27f0b4293cc2578e3ef630a