Malicious PDF — malware analysis report

Static analysis result for SHA-256 451ce60d7c1897e1…

MALICIOUS

PDF

83.1 KB Created: 2021-02-21 08:57:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bc21ac2b005f6bb8805aabfa6aa39c88 SHA-1: 46c92cee08979dac365c083db0accb2d5f56b08e SHA-256: 451ce60d7c1897e18970489212624ceb55c7238c6a28bfc29780edbed806736c
196 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are SEO redirectors, suggesting an attempt to drive traffic to malicious or ad-fraud sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or a trojan downloader. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/strik?utm_term=what+are+examples+of+information+technology+careers PDF link annotation
    • https://cdn.sqhk.co/pobopuwubox/gdhgnie/sky_force_reloaded_switch_metacritic.pdfIn PDF document text
    • https://tirotirow.weebly.com/uploads/1/3/1/3/131380420/1077789.pdfIn PDF document text
    • https://cdn.sqhk.co/besiwowegin/iaEAphj/wemubunokuwatipuw.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/LVm1ggK/f1_manager_2020_guide.pdfIn PDF document text
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/9056409.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/heIibhc/like_a_boss_meme_impractical_jokers.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/idieigP/47478770377.pdfIn PDF document text
    • https://kikitepolo.weebly.com/uploads/1/3/4/5/134514310/8970045.pdfIn PDF document text
    • https://vipukawolatu.weebly.com/uploads/1/3/4/4/134486161/3c5bb.pdfIn PDF document text
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/1528490.pdfIn PDF document text
    • https://cdn.sqhk.co/rorazelesu/fjeGgfv/gexakifadizadolaxunux.pdfIn PDF document text
    • https://lodarexuxune.weebly.com/uploads/1/3/4/3/134352809/1868935.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/jgiicvj/10010936661.pdfIn PDF document text
    • https://sexanugujox.weebly.com/uploads/1/3/4/2/134266496/fadut.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/fevobelijogal/kesikuwojevivexe.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/acute_otitis_media_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/20416573895.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/cafeland_mod_android_1.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/jezirevesowemufejumawi.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/ifrs_16_lease_accounting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/32931576067.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/dowenefalogodisigorokub.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/govudiga.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_off000107a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A3 5612 bytes
SHA-256: ab6c86cb43c3fa7fd613c72e2351603a172547ffebc739000fd7e11ebe229300
font_01_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 10512 bytes
SHA-256: 8a602ba963bc0879be18c8630bd6a7c1f36e98959d6c149b55232737d164fc91