Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc089a1bd839fbd…

MALICIOUS

PDF

89.3 KB Created: 2021-03-17 09:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6453dc7a2fb4a62feb511c2dca18f412 SHA-1: b1684648c20ced8a63928ae0be630d3b15e07b1f SHA-256: bcc089a1bd839fbd21b40d613dd8ee85c5b839e3ce6c9f67f15ddbd1d468e041
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=2017+tempstar+furnace+reviews PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405929/normal_5fdcb00900ee3.pdfIn PDF document text
    • http://wozuxel.getenjoyment.net/6119114448.pdfIn PDF document text
    • https://viremekim.weebly.com/uploads/1/3/1/4/131407965/walikuva-bivitujenekir.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/firex_hardwired_smoke_detector_installation.pdfIn PDF document text
    • https://xowebanum.weebly.com/uploads/1/3/1/4/131453595/5459e.pdfIn PDF document text
    • http://javefuxola.getenjoyment.net/akta_atipsom_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407301/normal_6038495adc72f.pdfIn PDF document text
    • http://berefiruzo.mygamesonline.org/symbolic_interactionism_sociology.pdfIn PDF document text
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/73c7e022cb5340.pdfIn PDF document text
    • http://sifimomikev.sportsontheweb.net/grammar_english_checker_online.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/apb_full_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493282/normal_600ffcd1466e9.pdfIn PDF document text
    • https://tewabigonin.weebly.com/uploads/1/3/4/7/134760563/nugukudol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_609d4498cd3a413abda91c57818f681e.pdf?index=trueIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_f139a16d0ad341a5b38688dddee6387c.pdf?index=trueIn PDF document text
    • http://ramufezumax.rf.gd/free_brochure_templates_pages_mac.pdfIn PDF document text
    • http://simusofitiralod.epizy.com/botiqun_de_primeros_auxilios_para_autos_reglamentario_chile.pdfIn PDF document text
    • http://gumizaxewa.atwebpages.com/shark_rotator_vs_duoclean.pdfIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_f546717df0f44b22985b8a7e7364eac2.pdf?index=trueIn PDF document text
    • https://d668ac4b-7052-46b9-8d0c-7e282d24ced7.filesusr.com/ugd/00fc84_7db0ab427f5248bb876f3737e7e130a6.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_e21b8b1a81c64db6aafa3bdace23c4ec.pdf?index=trueIn PDF document text
    • http://nejimafalun.onlinewebshop.net/zopevafafurafe.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_off00011d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 5592 bytes
SHA-256: 1a893ac3326fbfd850379967b2d280cbd0452009003765dc03aea00bed7381d8
font_01_sfnt_off000130a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A9 11024 bytes
SHA-256: 58f613f144b34b9f5a82bb5ab932fc7efcd937ba25e077bb14e2566898e385fb