Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddcfb03c91b89eb…

MALICIOUS

PDF

79.2 KB Created: 2021-04-02 22:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 34c4f32688a76e1fdf7f7bd9a30563c4 SHA-1: 5f7d4d45daddf4b84c5158b23cc153b0ffc1ae5b SHA-256: bddcfb03c91b89eb190068c3acf74fbdd8b9d1d64d4b0065bc3223d2abadc343
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by a machine learning classifier and ClamAV. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or SEO manipulation tactic. The document body, though heavily obfuscated, contains references to SEO keywords and the wkhtmltopdf tool, indicating it was likely generated for link-farming purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=how+to+get+s+rank+lol+jungle PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374189/normal_5fce99551b96e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378149/normal_6032700ac85a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369317/normal_5fde29af1fcb5.pdfIn PDF document text
    • https://gebobofivogaxe.weebly.com/uploads/1/3/5/3/135308574/7870096.pdfIn PDF document text
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/janukalul.pdfIn PDF document text
    • https://busozovamifolak.weebly.com/uploads/1/3/4/2/134235369/13d6c1d08.pdfIn PDF document text
    • https://dugepenen.weebly.com/uploads/1/3/1/3/131379306/sesabez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527345/normal_6041d18c8b75c.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/VYXhWid/pocket_rocket_stove_kit_review.pdfIn PDF document text
    • https://cdn.sqhk.co/tikugosedik/ifgdJjj/zatativu.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/hhej0gi/big_sharks_fish_and_chicken_decatur_il.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477637/normal_5fe3ebce5df7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530712/normal_5fe4897542e45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421042/normal_6018398fbebc0.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/Ld9ifha/26348649494.pdfIn PDF document text
    • https://cdn.sqhk.co/temegolu/ficJTlx/64253881805.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/rghyUgf/fulowinilate.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/WT6s8CB/webiwaxakowudot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380691/normal_5fcf963fcf385.pdfIn PDF document text
    • https://cdn.sqhk.co/sifomujotaxa/gjciege/70s_music_greatest_hits_of_the_70_s.pdfIn PDF document text
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/xavajewilolabu_raruwewejukif_robuzafageru_xalidemodusud.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/euhb8hT/jowewixisevekumimatog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/263a72c1-7b72-40c4-a236-a980920b73e9/milibozugopuruvemozakibis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af616c69-314b-446e-b79d-1e73e603f7fa/data_management_executive_salary_in_singapore.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_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 5048 bytes
SHA-256: 93735fb047ebd21f504b79fc630433684c9ed1ea6ce232a49593c996a25f2234
font_01_sfnt_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 10820 bytes
SHA-256: aa78f84d8c191bdda59c2fa68f608604e1fed78fd84bfd9cdc785b1a75dfa6c5