Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e42be9d7a2fec3…

MALICIOUS

PDF

113.0 KB Created: 2021-03-14 10:32:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 250b97e6d7168f6b7624a50993bdf7ca SHA-1: 23468c864947992dd6b0fcaace11481d28503c3b SHA-256: 88e42be9d7a2fec32d8116ad2935e6b4e963ce2f425a1833f5395886a21e471c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, and one specifically links to 'botokaw.ru' with a 'visual+basic+book+for+beginners' UTM term, suggesting a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://botokaw.ru/strik?utm_term=visual+basic+book+for+beginners PDF link annotation
    • https://vimedapajabapi.weebly.com/uploads/1/3/5/3/135309909/6048351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452193/normal_602b4241310c5.pdfIn PDF document text
    • http://majikok.mygamesonline.org/how_to_program_a_directv_remote_to_a_vizio_sound_bar.pdfIn PDF document text
    • http://wotaxatumumodok.sportsontheweb.net/30527704222.pdfIn PDF document text
    • https://zuvoxowiton.weebly.com/uploads/1/3/0/8/130813332/025d72.pdfIn PDF document text
    • http://wodedutipif.medianewsonline.com/wolkenstein_problems_general_physics_solutions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475559/normal_5fec5b82459bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496013/normal_5ff7926f51285.pdfIn PDF document text
    • http://znatural.space/sqlite_integer_date_formatkymwr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_6018022716714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_6038d76590afc.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/lojogijotirodf08zm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371265/normal_5fe3ecb78558e.pdfIn PDF document text
    • https://bafiredevidif.weebly.com/uploads/1/3/1/3/131384403/08814ebeaa47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497372/normal_5fe4f2da38c84.pdfIn PDF document text
    • http://presente-top.store/29368750719y3qij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482625/normal_60033586467c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500183/normal_600388cd91062.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/canon_580ex_ii_ettl_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/cartoon_app_for_android_free.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/what_are_examples_of_plant_assets.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/chakra_guided_meditation_for_sleep.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/50124201615.pdfIn PDF document text
    • http://kilarosine.atwebpages.com/ra_1364_sanitary_engineering_law.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B1A 5216 bytes
SHA-256: 3c0ad4632810884d36bbb38d3396bcbc2c2becac50077ce45373d4eeefd77236
font_01_sfnt_off00018cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CF6 12096 bytes
SHA-256: d8e19aa1124ce1715802400b1a8d3452f4b10a1eb1f5790873c15f6b593855ed