Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72c87ef26487c32…

MALICIOUS

PDF

86.0 KB Created: 2021-03-17 11:16:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39fa9c70aa672e8f65aeb0a657243d4d SHA-1: 11f185d2c8f14571c2338062b678d3cb955afb6c SHA-256: b72c87ef26487c32534a046989dd438b5c904f113c8058a4e4e67918f7f2c370
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a PDF link farm containing numerous external URLs, suggesting an attempt to redirect users to potentially harmful sites. While no scripts were directly extracted, the presence of embedded URLs and the link farm structure points towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=esl+placement+test+pdf
    • http://gelupulofevabek.medianewsonline.com/attached_is_the_file.pdf
    • https://cdn.sqhk.co/mibemofega/djc5QAj/86104017944.pdf
    • https://cdn.sqhk.co/lituxopevuk/ige5Rhb/7453182291.pdf
    • https://cdn.sqhk.co/falupuvevore/7injjgf/45394732334.pdf
    • https://cdn.sqhk.co/birofinud/JgjLarl/paypal_stock_symbol.pdf
    • https://static.s123-cdn-static.com/uploads/4450733/normal_5fe08cab58f33.pdf
    • https://totupima.weebly.com/uploads/1/3/1/4/131438580/4792119.pdf
    • http://dobofozepop.mygamesonline.org/39242122494.pdf
    • http://sejerodetupumil.medianewsonline.com/43699690589.pdf
    • https://cdn.sqhk.co/sunidoxil/hf2gdhd/mit_app_inventor_screenshot.pdf
    • https://static.s123-cdn-static.com/uploads/4369916/normal_5fee7d3b06fd5.pdf
    • https://betetitowuti.weebly.com/uploads/1/3/4/3/134331261/38b5551d1c0d.pdf
    • https://cdn-cms.f-static.net/uploads/4494868/normal_5fd86a4853354.pdf
    • https://static.s123-cdn-static.com/uploads/4415065/normal_5fc5f79189da6.pdf
    • https://zodazapel.weebly.com/uploads/1/3/4/5/134511258/birixidibonatot-majelexixa-kurepizife-marivuj.pdf
    • https://cdn.sqhk.co/wizokawoxo/dzhhigq/80403848376.pdf
    • https://nunajamedagafep.weebly.com/uploads/1/3/5/3/135325778/minuwil_dusutabavafimi_genepiliz.pdf
    • https://cdn.sqhk.co/dijawagag/jiiejhi/53065801024.pdf
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5fd7765846e1b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fararisujis.myartsonline.com/78743043452.pdf
    • https://s3.amazonaws.com/fifuto/love_whatsapp_status_telugu.pdf
    • https://s3.amazonaws.com/robumuduluwise/pirates_of_the_caribbean_piano_sheet_music_medium.pdf
    • http://wadoromutisagar.myartsonline.com/75362936748.pdf
    • https://s3.amazonaws.com/sobaketemu/bilefezozibukijovek.pdf
    • https://s3.amazonaws.com/kopisigapub/zifozajanopid.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001044c.bin
640d603bc65fe42a6ae6c39c310a631419ea1eb0799ed0457da31768b0da0ff2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1044C 4792 bytes
font_01_sfnt_off0001147d.bin
8a163483d4a64bf8797c68408f41663b541a96589b4065a14b9252730577ba6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1147D 11260 bytes
font_02_sfnt_off00013abe.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABE 4324 bytes

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