Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b046040773fcc7…

MALICIOUS

PDF

101.9 KB Created: 2021-04-13 00:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ced29caea406ea1204a44f44278ff644 SHA-1: 0f574e6cec5e2839e7d0b38364e2bc18a91f10a9 SHA-256: a9b046040773fcc7c6e68ae32ed879d1a850a5b0e2e8831e7fbd81306aa12eb3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fokemale.ru/strik?utm_term=how+to+write+rap+lyrics+in+hindi PDF link annotation
    • https://cdn.sqhk.co/gepeduvo/igjcCxK/zezarisujimukawev.pdfIn PDF document text
    • https://xowonijateroz.weebly.com/uploads/1/3/1/3/131380337/3452673.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/Cib0YDY/hd_wifi_cam_pro_manual.pdfIn PDF document text
    • https://refefutetolesom.weebly.com/uploads/1/3/4/8/134868450/sariwoku-sixukibixamit-taluzedov-mukobet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404297/normal_602be37fda48a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470019/normal_605f8a04bd233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416494/normal_5fd6ccfee4b7b.pdfIn PDF document text
    • https://mosofekux.weebly.com/uploads/1/3/1/4/131437457/tonaniwuveveki.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/gupebevuxefijar.pdfIn PDF document text
    • https://zifimegepero.weebly.com/uploads/1/3/4/6/134601706/3266760.pdfIn PDF document text
    • https://jarowezib.weebly.com/uploads/1/3/0/8/130813985/sodanatutu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414489/normal_605306e7a55ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480162/normal_6057abbd400c3.pdfIn PDF document text
    • https://bigakajufejala.weebly.com/uploads/1/3/4/2/134265656/4546920.pdfIn PDF document text
    • https://sawanizoso.weebly.com/uploads/1/3/4/6/134654845/joguzinomazoruli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://00e6f838-d17c-4130-b616-1adf5f4d9bb3.filesusr.com/ugd/714321_2a97b022b10541a38089b85b23785a82.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_e3b5ec76beb049e28a2cda44169651dc.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_5dfb2d97a6c64557ae5928f9c5a7f2fb.pdf?index=trueIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_859c9669006741a1972e0781e9c8d4f7.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00016fc5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16FC5 17324 bytes
SHA-256: d3a0fbba648d68906e1c38bfbe4991a57de6e82894666dad3ebfad650044ee9c
font_00_sfnt_off00012220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12220 3776 bytes
SHA-256: 5c8ce053674138b26c742fb08c873334dbf42af59d115025b7f97cdbf689aa8f
font_01_sfnt_off00012faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAF 5316 bytes
SHA-256: b57161490cb0971e2f03d2369aea70eb9ddf46b0b706ab3783207ee866b304ea
font_02_sfnt_off000141cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CC 15268 bytes
SHA-256: e425a8720b12e18a2162af567326107424d36e09e8dc1990f741cb7897c1a6a0