Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd35ae329ca79b4…

MALICIOUS

PDF

148.6 KB Created: 2021-04-23 10:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a1e937dd0376c03690028c0ac0287cb4 SHA-1: 91d25bbe31d697fedd3151f8baa59044d9791cc4 SHA-256: 2dd35ae329ca79b47bc36c60ede66e37f7c64c455f3797e5f7bfd6039dba43ea
146 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://soxebez.ru/strik?utm_term=lg+nortel+phone+system+user+guide PDF link annotation
    • https://zepafasamog.weebly.com/uploads/1/3/4/3/134361306/votumuvaradufal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391303/normal_605985cbd1f08.pdfIn PDF document text
    • https://lamipozalunem.weebly.com/uploads/1/3/5/3/135308558/mavuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392215/normal_6049e715b0360.pdfIn PDF document text
    • https://kibanelamuvudu.weebly.com/uploads/1/3/0/9/130969844/damokogetelaxazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459463/normal_5fdabca1ef2f5.pdfIn PDF document text
    • https://lumejukotexute.weebly.com/uploads/1/3/1/1/131163930/63f3104ba76.pdfIn PDF document text
    • https://jinuwipalo.weebly.com/uploads/1/3/5/3/135332432/temekemitexazukifo.pdfIn PDF document text
    • https://peninovafaron.weebly.com/uploads/1/3/4/3/134320426/kuzebolujumunix_kefodazasirox_tivuzigavitoj_bezura.pdfIn PDF document text
    • https://monisobagarov.weebly.com/uploads/1/3/1/8/131856119/5376219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_60248c85080a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f1a72ce7-9289-4f52-8cd0-6ceb55a1d062/gogirasubirefobob.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/riliwikelafogakagasobok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb31f8bd-9c7b-494f-af8e-c5553cbf0ded/why_does_my_troy_bilt_lawn_mower_wont_start.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/22579811402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3213c17b-b94d-4766-a48d-f755c4889f62/how_to_connect_vizio_tv_to_bose_soundbar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b5b2f2-14f3-4854-a7e3-1b20a6fd317b/68165516648.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/71199976797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9413f41b-8c83-4b9d-9cb1-7ce0b46beb12/80871534034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba6ea436-99e6-47ae-bbd9-79498797ee1f/kasawizirap.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5B5 5088 bytes
SHA-256: 7f4ee033f9291785c712f715c530a55ba846a2404c58e02c3e2c9b74bd40a8ca
font_01_sfnt_off0001f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6DB 12144 bytes
SHA-256: c54748c5807ff708565b8311897fcd1374fede393fd547cab06aa3c4676d8f49
font_02_sfnt_off0002207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2207F 16092 bytes
SHA-256: 1733294cd4efe6eb5a1c38b033a3da0bd69f43be3259469e0667c8323d1c848a
font_03_sfnt_off0002353c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2353C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c