Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f55a3c3e4499817…

MALICIOUS

PDF

87.8 KB Created: 2021-05-26 10:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6521a159580231ed7a5b64d21506078 SHA-1: 215aa88c3ab7237fc6f8ec82d9e5fac5f28afc44 SHA-256: 7f55a3c3e4499817e96dfd10c9eeecfe852eb250ff03a5cb7b5b324f81326a45
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://leonvi.ru/strik?utm_term=sample+adverbial+phrase+sentences
    • https://vomefamatufovo.weebly.com/uploads/1/3/4/3/134378522/dexutizutej.pdf
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/481f1e9379.pdf
    • https://gimipozadifan.weebly.com/uploads/1/3/1/3/131380487/potobegijuxu_lunitawineb_pigojuv_pugolago.pdf
    • https://cdn-cms.f-static.net/uploads/4388839/normal_605706bff355a.pdf
    • https://cdn-cms.f-static.net/uploads/4367304/normal_60383ae2d574c.pdf
    • https://zekenegelu.weebly.com/uploads/1/3/4/3/134390475/656aabd7de2f.pdf
    • https://lowarimubabop.weebly.com/uploads/1/3/4/7/134712264/d5b8f.pdf
    • https://xukotonaxi.weebly.com/uploads/1/3/1/4/131453431/kenuroxobovubi.pdf
    • https://static.s123-cdn-static.com/uploads/4382771/normal_5fde9f14e62b5.pdf
    • https://xanojamazifedim.weebly.com/uploads/1/3/5/3/135323589/2497931.pdf
    • https://moxidoneke.weebly.com/uploads/1/3/5/9/135993461/3918261.pdf
    • https://cdn-cms.f-static.net/uploads/4366003/normal_6028f2a4b9cdf.pdf
    • https://cdn-cms.f-static.net/uploads/4419650/normal_60296f231a7ab.pdf
    • https://cdn-cms.f-static.net/uploads/4413244/normal_6060222182342.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lebaxa/runaxovowopavakal.pdf
    • https://s3.amazonaws.com/zusevamasor/buffering_accelerator_software.pdf
    • https://uploads.strikinglycdn.com/files/ceeb66d8-a8b0-45c7-b162-054eef0b7bf9/tululakipafugijekekupa.pdf
    • https://s3.amazonaws.com/boduxatavepe/xezudukobana.pdf
    • https://uploads.strikinglycdn.com/files/ae1af70c-22bf-4bb5-8bad-de40908c77fe/nouns_worksheet_for_class_6_cbse.pdf
    • https://uploads.strikinglycdn.com/files/e7908798-8ec2-4b8e-8563-f355821f5288/jikowukopiroxefipusefoxif.pdf
    • https://uploads.strikinglycdn.com/files/e84ed8c3-9f1a-4e21-8d14-62603b6a3157/husqvarna_gt52xls_mulch_kit.pdf
    • https://uploads.strikinglycdn.com/files/cf18e1eb-1727-4135-a64c-dcfe052cb7e5/68191566891.pdf
    • https://s3.amazonaws.com/kefiperizonofu/82616051706.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4bf.bin
60fe3474914c6facb80a8825fc8b15a4032f4af7f58249bdd597998b049c9d5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 5616 bytes
font_01_sfnt_off00010799.bin
a76029d7adb10d5616584c4c91c3c77ab6d6120a7111bf6603fbf1a401b12fee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 2520 bytes
font_02_sfnt_off000111ee.bin
86148872809b3001a4c6f8bb2dcd4b2149fc621912bf311ff4ff83d3f57e5044		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111EE 13232 bytes
font_03_sfnt_off00013a32.bin
c15b8ab84076b32f0b4bc91c1e4782e5735064c68d787d185e9541ce37f143fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A32 16116 bytes

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