Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b4c4badf22d5f4…

MALICIOUS

PDF

77.5 KB Created: 2021-04-07 01:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ce83bc4594480661a96c95f053f77b41 SHA-1: 58eedbe3ba4da888b5160690bff7651dc048ee02 SHA-256: 97b4c4badf22d5f4dad6b65bca0cb2643e8774645c60f3f8d5a163e526aa068c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating a link farm designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs and the PDF structure itself points towards a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/123?utm_term=android+kitkat+name+origin PDF link annotation
    • https://cdn.sqhk.co/vukobefebu/729ugjR/antivirus_software_for_android_tv.pdfIn PDF document text
    • https://zatofurepodato.weebly.com/uploads/1/3/1/4/131482853/6906866.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/ifJOdAZ/tewukalakaxururomoxu.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/aaa5691101e.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/gSie9ih/word_wizard_crossword_solver.pdfIn PDF document text
    • https://nerilumasufut.weebly.com/uploads/1/3/1/4/131437044/01ad7.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/bxjfu0i/vitog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_1f144355ce754f38891c3c9ef5f5a2df.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_b6e4f7a3271d49a2826d6817d1ae29db.pdf?index=trueIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_632c34a1736d45f2828e494871350323.pdf?index=trueIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_7345cbd12c794a75b1a5e01b55892f00.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_f5e29a3863da43658cc149840c4cfc13.pdf?index=trueIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_18031d9244fa4789aef43488cf87fb52.pdf?index=trueIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_f9b9f610ce324cf3a4bea95bb0165237.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wozoxub/badbadnotgood_iv_sheet_music.pdfIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_1edc724431594001b22061b5a4a073dc.pdf?index=trueIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_9e359a307ff14615930957f2e6a687d9.pdf?index=trueIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_33eb024ebd4749c4ac050ef86184f034.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/thetford_rv_toilet_maintenance.pdfIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_9c3f9875ee5b4101b576f3b380d9943c.pdf?index=trueIn 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_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 4988 bytes
SHA-256: 30b87bbd74a0d3eb6eb5c80493f9414082770da538b188b2d1047fe4e4b16c11
font_01_sfnt_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 10820 bytes
SHA-256: a6feed1507d1da3864be7596281726dda9c9fa0b252d0f330a0fbbddb07a1bc4