Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f2b8c215583b03…

MALICIOUS

PDF

72.5 KB Created: 2021-02-27 04:07:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec458e321a05cf8b0770f8db8031a9fa SHA-1: 5169903a55874656da2f97e35733774c9bb91188 SHA-256: 03f2b8c215583b03b9083baafa0e7a0668b87ca0d20ee5405ee9584a708f8c58
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_LINK_FARM indicates a large number of links, suggesting an attempt to create a link farm or distribute various malicious payloads. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://pelibifir.ru/123?utm_term=american+museum+of+natural+history+nyc+free+day
    • https://cdn.sqhk.co/sifalavuxozo/3hcfgd7/spongebob_game_frenzy_mod_apk_free.pdf
    • http://com-login8.xyz/cloud_9_ranch_arkansaspucuf.pdf
    • https://cdn.sqhk.co/vewukiziwemi/q8ijGon/greatest_hits_of_all_time_spotify.pdf
    • https://cdn.sqhk.co/fenazijeguk/jieNx1D/thoroughly_modern_millie_movie_tagline.pdf
    • http://copyright-central-media.com/gupusenolezar111.pdf
    • http://itwow.info/tigipilumomegibupewinil9dz5r.pdf
    • http://swiss-gear-top.xyz/8958855224053uqg.pdf
    • https://cdn.sqhk.co/visukodo/hc1jbie/lumosivurug.pdf
    • https://fekodajitor.weebly.com/uploads/1/3/0/8/130874258/rawiwajituri.pdf
    • http://myluckybet.xyz/88717967961epc2g.pdf
    • https://cdn.sqhk.co/fegibidizog/oggmThe/jjba_soundboard_android.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/doxifuba/nefekijonesemow.pdf
    • http://gutekuretejapoj.onlinewebshop.net/mit_otara_campus_map.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de82.bin
0854a716aac87e7548c78673615d419db35549ee63e0e13cbc6332dc090129d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 5352 bytes
font_01_sfnt_off0000f08c.bin
22dab64ca228d6a11208cf05e083fb61618671088b5b9a4b3dd0ce7785603119
pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 10824 bytes