Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c95acd81786b7d…

MALICIOUS

PDF

76.3 KB Created: 2021-02-12 10:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ea9b050d61d4e344d07baec2ea4ce942 SHA-1: 171f3018808f078f9da426b9668bfa6ed3f1de25 SHA-256: 34c95acd81786b7ddefdaa87ad2fdeadc9ace6994d01e09574d1bfaa174de2f3
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, identified as a link farm and SEO redirector, pointing to various PDF documents. The primary malicious URL is 'https://druttle.ru/wix?keyword=unitary+elasticity+definition+and+examples', which is used as an image lure. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. No scripts were extracted, but the structure suggests an attempt to drive traffic to malicious or spammy websites.

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
  • 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://druttle.ru/wix?keyword=unitary+elasticity+definition+and+examples PDF link annotation
    • https://cdn.sqhk.co/lewulula/ghBjg60/modern_warfare_season_6_release_date_australia.pdfIn PDF document text
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/7b05c595eb.pdfIn PDF document text
    • https://cdn.sqhk.co/roweziwamu/ecjhKT5/csr_classics_gold_glitch.pdfIn PDF document text
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/riguboj.pdfIn PDF document text
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/7729dbb.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/aaihEI8/flyvpn_mod_apk_cracked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498997/normal_601b188e43dc8.pdfIn PDF document text
    • http://rubeatyshop.xyz/79826598347wzuba.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/zodawanuror/brandon_grotesque_condensed.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/27873513856.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/hantek_cc-_650_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/iatse_212_rate_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/day_of_dead_mask_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/esmo_guidelines_gastric_cancer_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/tezoxoxevogatadep.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/proper_cable_fly_form.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_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 5460 bytes
SHA-256: 905c96de037db3c2719dce6dbe4632ec1003b559f270f16454566570a4b58df6
font_01_sfnt_off0000ffd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 10596 bytes
SHA-256: 6558765c3f0aee03a861e2d81690c7165ba74b1fbc419ace3c14d1a8ae56ad2e

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