Malicious PDF — malware analysis report

Static analysis result for SHA-256 243f6594ec1d637f…

MALICIOUS

PDF

72.8 KB Created: 2021-04-01 02:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0602467c0d87cdf1497d92782bb80a61 SHA-1: 55765130abea06af7c8799a7ab35cffe0ddf7558 SHA-256: 243f6594ec1d637ffbb68ceba82deb52600bf2700c60ec6f605d9062616379eb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. 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 0.9998

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://zajinet.ru/aws?utm_term=how+much+do+interior+designers+charge+in+kenya PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485930/normal_6019a16fa078e.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/Hjfhaie/ninja_robots_cartoon_network_episodes.pdfIn PDF document text
    • http://mizifasurogik.mywebcommunity.org/42422597288.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499309/normal_60035fd5a61c2.pdfIn PDF document text
    • https://begagezegitajaj.weebly.com/uploads/1/3/1/3/131398046/6008440.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/ib8nnPT/lutozudi.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/Ojeiggf/just_dance_apple_tv_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/hdRhbNo/65012834505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409826/normal_601b286251831.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/zejomuporefe.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/broiler_breeder_production.pdfIn PDF document text
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/sojenuf.pdfIn PDF document text
    • https://cdn.sqhk.co/gujipiror/2jhjdCy/pocketmine_mp_plugin_tutorial.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/44666036156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447641/normal_603d2de346a42.pdfIn PDF document text
    • http://kuzexamipapoxip.medianewsonline.com/biology_notes_form_3.pdfIn PDF document text
    • https://neseroto.weebly.com/uploads/1/3/5/3/135326238/73ac023640aa59c.pdfIn PDF document text
    • https://mivojunap.weebly.com/uploads/1/3/4/7/134720575/667661.pdfIn PDF document text
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/sojobozozoka_gimip_vimiro.pdfIn PDF document text
    • https://penopamez.weebly.com/uploads/1/3/4/4/134496097/pisiwes-vodanareleb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 5540 bytes
SHA-256: f5eae3d41cd058416ecab5ed60382ba6311e6a280ff8b4f15b38c4b12921806b
font_01_sfnt_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 10544 bytes
SHA-256: e312fa0904fd776f5665e0d255fc54e188c9dac0edd22a5a003f0df32d0fdfee

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