Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7f55c8608a5866…

MALICIOUS

PDF

82.2 KB Created: 2021-05-03 11:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2b31eea50a3a2afc3348ec4c1257625d SHA-1: 0738091e7c3bc33d60f975bf8fe42da092d5360e SHA-256: 2c7f55c8608a5866eadbcbe818950e0f79dee9833d93a34703bde4b90a48417d
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which appear to be part of an SEO link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/strik?utm_term=john+deere+hpx+gator+starter PDF link annotation
    • http://carins.info/is_it_possible_to_do_strength_training_without_weightsosj1w.pdfIn PDF document text
    • http://daravto18.ru/25318114745jvh4s.pdfIn PDF document text
    • http://strita.space/gamawinenavuruq5m8n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449205/normal_5fc6ca9582426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408701/normal_60107180ca576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_601d257ff14ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465386/normal_605a7856d377c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483362/normal_6049cf770416c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_603314cb131cf.pdfIn PDF document text
    • http://predouche.xyz/bright_beginnings_soy_pediatric_drink_nutrition_informationjb803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463565/normal_60170e398e1bc.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/rogugagatuf/92038562474.pdfIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_fd91ca45893f4e068a62a2106e5fc0d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/jesosopawujimusugorod.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/senemuxolesexotoliwolu.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/black_body_radiation_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/chartered_financial_analyst_job_opportunities.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/what_does_slang_word_alpha_male_mean.pdfIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_f18fdfcb6ffa492983ff35f2a8e06ba7.pdf?index=trueIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_0fc6f906d2144c48aceaaec0f7d0f0eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zonebon/amon_amarth_berserker_full_album.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/furozugus.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 5248 bytes
SHA-256: 309e510a1921c5cf21a237d2a8be4a478119ab67dbca975786effb1a729b58fb
font_01_sfnt_off0000fe23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 11588 bytes
SHA-256: e366081ff960eba2123afac42021fdafd2ce2161fd24d9c1e2217bb24863a156
font_02_sfnt_off000125d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D6 16164 bytes
SHA-256: 0646a63a478fe53468b8dbbe05b608d617a04836cde27f490c8d0ce00ae8a9f2