Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca29656ddea451c…

MALICIOUS

PDF

81.0 KB Created: 2021-04-03 18:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b3a95448ed13577c26bb8197b0ad935 SHA-1: 7dc343d97a753216d8f47ef44d9cdaae21ef8548 SHA-256: eca29656ddea451cfe356755fa2fcae98a74ca202f72a89ff834e9d7561cefcf
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm, and includes lures such as 'download button' and 'urgency'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links suggest it's designed to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/strik?utm_term=go+go+elite+traveler+4+wheel+specs
    • https://cdn-cms.f-static.net/uploads/4420036/normal_602c57fdc5582.pdf
    • https://cdn-cms.f-static.net/uploads/4449009/normal_604f99d27605b.pdf
    • http://matteset-spon.space/bissell_proheat_cleanshot_2x_user_manualcpcth.pdf
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5fe752e1d4195.pdf
    • http://dumovabitoda.22web.org/gixakedagawexijone.pdf
    • http://vinnipoh.fun/3180447811cppz4.pdf
    • http://white-x.fun/atomic_structure_worksheet_introduction_to_chemistry_answer_keyzwgnj.pdf
    • https://cdn-cms.f-static.net/uploads/4380523/normal_6062de62933c2.pdf
    • http://tiktoktop.design/top_10_android_phones_listpx9b4.pdf
    • https://cdn-cms.f-static.net/uploads/4413112/normal_601cb17f96e87.pdf
    • http://mebets.xyz/9219599021nhyo4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/betefowubevat/auto_block_calls_android.pdf
    • http://nasuxenabo.epizy.com/jijotonobowugifugifiw.pdf
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_fa71c39f93114eff8f09b4698965f2f1.pdf?index=true
    • https://s3.amazonaws.com/rezugekolaba/how_long_can_a_live_christmas_tree_last_in_singapore.pdf
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_26a60f6b7b0241f19331d5445e64c784.pdf?index=true
    • https://uploads.strikinglycdn.com/files/abd88475-6894-4bc3-84f8-c7f906a9d501/are_the_stones_at_craigh_na_dun_real.pdf
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_b4d35a07cf5947a6b42cb97fd32c4b86.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6acbc9c6-2914-4137-9c69-f0416ab5ad15/68631357755.pdf
    • https://uploads.strikinglycdn.com/files/59866fd7-f18c-4095-a208-17fd26e0fca7/que_es_un_sistema_de_referencia_inercial.pdf
    • https://uploads.strikinglycdn.com/files/d98d3f33-d8b3-4171-9fd2-55ac23bad4c4/fativegemititeg.pdf
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_3085b1b4712d4b63863d0fcae0f72229.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ac7ce781-4e5f-4065-b49a-042d1fe4cc17/nezozixataxufuredokaruxug.pdf
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_796c6cf4ff2e465b8741520093c16dfc.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbd3.bin
e81233a5a9064db5b98901bfe38dc5c00377718f9ee5870e3bb5636cd572bfca
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 5464 bytes
font_01_sfnt_off00010e8e.bin
60cc5bb8e911018d1a10759e50bfa62c797c784156ec259be2c99180c3814da6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 11860 bytes