Malicious PDF — malware analysis report

Static analysis result for SHA-256 6773d6ab55317a48…

MALICIOUS

PDF

77.9 KB Created: 2021-04-25 00:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed83c6ee77a1a1730492883433997256 SHA-1: b537159bb01816e324d67c642d63d304ff9b3414 SHA-256: 6773d6ab55317a4805ef3bc370138d2880a36fb72553b8addd4001dcb6a748a8
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting a phishing or malware distribution campaign. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=anker+keyboard+paired+but+not+typing
    • https://static.s123-cdn-static.com/uploads/4403806/normal_5fc849574ae64.pdf
    • https://zekorawuj.weebly.com/uploads/1/3/4/8/134862422/6450128.pdf
    • https://cdn-cms.f-static.net/uploads/4384028/normal_6013b8e30d68d.pdf
    • https://sakolepak.weebly.com/uploads/1/3/4/5/134588428/vibafusurixejo.pdf
    • https://fotobuwab.weebly.com/uploads/1/3/4/3/134368258/8e4e9de.pdf
    • https://burazukukoxuvi.weebly.com/uploads/1/3/4/0/134096138/2545936.pdf
    • https://mebotorafegamor.weebly.com/uploads/1/3/0/7/130739377/xumariwebemofudula.pdf
    • https://cdn-cms.f-static.net/uploads/4498997/normal_601d244748afc.pdf
    • https://static.s123-cdn-static.com/uploads/4382789/normal_6000d9f4f1344.pdf
    • https://nokaxogu.weebly.com/uploads/1/3/4/5/134520383/laritu_xexefu.pdf
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/wumewaxutiserem.pdf
    • https://cdn-cms.f-static.net/uploads/4420039/normal_6048356aa4870.pdf
    • https://kujunegisim.weebly.com/uploads/1/3/1/3/131380440/1308535762.pdf
    • http://gemosugobez.22web.org/lomuzeganejujevixe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kivudul.rf.gd/vw_tiguan_2016_service_intervals.pdf
    • https://uploads.strikinglycdn.com/files/c6812049-79bd-4656-8148-b95b60bacccd/venn_diagram_meme_maker_3_circles.pdf
    • http://vutuzepen.epizy.com/wusiwiliwosojaridan.pdf
    • https://uploads.strikinglycdn.com/files/bb820330-fec0-4ef1-aa14-97440d55cb6a/85775702550.pdf
    • https://uploads.strikinglycdn.com/files/1a1c0a5e-c991-4545-a0e1-8a1d47998b35/vba_programming_guide.pdf
    • https://uploads.strikinglycdn.com/files/4aa5697e-cfd3-4839-9caa-3ed9dd89b08c/58102529648.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_off0000f05f.bin
35c1d797fc1d37055647e8cf044bc7f8453e2825d73743c52b745720fe56a9f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05F 5212 bytes
font_01_sfnt_off00010238.bin
84a7ba3f5c033e5080eb1037e337ce2ef91db12205ca3a1ed9ce03dbca904809		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 11712 bytes

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