Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d44a5910ed51ee7…

MALICIOUS

PDF

78.3 KB Created: 2021-05-31 09:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42c72931b9fb54892a2f5967f75c0957 SHA-1: 6f1ba3e36a1d09a7041aa39b7a4bb0e5506c9569 SHA-256: 1d44a5910ed51ee71f9de6d221b08e05fa0257aaed6189b7c88733427169435d
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a download button lure further supports a malicious intent to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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
  • 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.
  • 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://jottigo.ru/123?utm_term=aircraft+structural+technician+book+pdf
    • https://jasuniwe.weebly.com/uploads/1/3/4/5/134515850/ddb400b3ca3987c.pdf
    • https://vapasunodisina.weebly.com/uploads/1/3/0/8/130873802/1182043.pdf
    • https://zovuwiveja.weebly.com/uploads/1/3/4/8/134880504/besatibebonusafe.pdf
    • https://cdn-cms.f-static.net/uploads/4403673/normal_603845415f1f5.pdf
    • https://cdn-cms.f-static.net/uploads/4369909/normal_603e1baf9996a.pdf
    • https://pejusokipa.weebly.com/uploads/1/3/4/9/134902294/gemizisavotaxofeduw.pdf
    • https://jidegumot.weebly.com/uploads/1/3/0/7/130776526/wemodok.pdf
    • https://static.s123-cdn-static.com/uploads/4385216/normal_5ffba4c4aa8f2.pdf
    • https://gusobenatidisa.weebly.com/uploads/1/3/4/4/134475091/4042664.pdf
    • https://tojuseviru.weebly.com/uploads/1/3/4/5/134513446/nonikulezafo_jofezudup_lutiwigebomid.pdf
    • https://fazajamol.weebly.com/uploads/1/3/2/7/132740605/lukisopore_gisogedopej_bodeselitalo.pdf
    • https://cdn-cms.f-static.net/uploads/4454558/normal_60302448d328d.pdf
    • https://nigupuwifiva.weebly.com/uploads/1/3/5/3/135329906/1605039c3e05.pdf
    • https://zezodejesamibiz.weebly.com/uploads/1/3/1/1/131164097/f7b90.pdf
    • https://tofikopu.weebly.com/uploads/1/3/1/3/131381225/8d90bed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/93aef291-2d15-4e8d-864d-90e3451559d3/rerosonaluxawifepideko.pdf
    • https://uploads.strikinglycdn.com/files/e39680da-e6a4-425a-b3fe-ffe9b81024f7/kajobekuje.pdf
    • https://uploads.strikinglycdn.com/files/a5d384dc-5b7a-481d-9483-935226501de7/sivapuranam_in_tamil_audio_free_download.pdf
    • https://uploads.strikinglycdn.com/files/3266663b-aba4-4074-87bc-7b01d8bf4bcb/19458803045.pdf
    • https://uploads.strikinglycdn.com/files/a8ca3f67-2eca-4f70-bbd2-48c1f34fe646/panasonic_pbx_tes824_programming_manual.pdf
    • https://uploads.strikinglycdn.com/files/450e32af-5415-4d3b-a0d0-58c78bbf15b8/what_is_true_happiness_essay.pdf
    • 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_off0000f0bc.bin
3860d2d953ca6b88c3c4f1589909fe4c1f6c7b97d0e922134da9a49aa49a18cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 5436 bytes
font_01_sfnt_off0001032a.bin
ee39983bd080d3683c6f727957bd92d767b64dc137038d23db3d50dca3320061		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 11316 bytes

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