Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1f857771b6c2b4…

MALICIOUS

PDF

69.4 KB Created: 2021-02-25 07:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 095ea490da01f19f50ae767e42db0e6f SHA-1: 82cb6817d35753f7c34b8e3b50ca2dcc19c55679 SHA-256: 2b1f857771b6c2b4e2c2cda45800c8307fb040dbe2519489b7c06df18f257cb1
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure and a large number of external PDF links. The ML classifier also assigned a very high probability of maliciousness. The document body is heavily obfuscated and unreadable, but the presence of numerous links suggests an attempt to direct users to external, potentially harmful content, possibly as part of a phishing or scam campaign.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=tar+river+tiller+review In PDF document text
    • https://taburexil.weebly.com/uploads/1/3/4/3/134374137/1822951.pdfIn PDF document text
    • https://gejiraje.weebly.com/uploads/1/3/2/7/132740564/nudesegabogulatanajo.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/ggne3Af/hero_xpulse_200t_bs6_price_in_kolkata.pdfIn PDF document text
    • https://tugadebijo.weebly.com/uploads/1/3/4/0/134042488/ac27973.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/cgfjhhg/xurefifofuwazibev.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/fhdIjcX/entrepreneurship_development_programmes_is_required_to_help.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_5fe73d0bef978.pdfIn PDF document text
    • https://zepekofudi.weebly.com/uploads/1/3/1/4/131407423/maxefupak_zowiwijuta_fowolenuvufamo.pdfIn PDF document text
    • https://sinidagiritab.weebly.com/uploads/1/3/5/3/135386058/4571924.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/tuluxutaf-wojedokomu-wopuda-limedixared.pdfIn PDF document text
    • https://kalogipewaga.weebly.com/uploads/1/3/4/5/134595512/wovulanesaruzapif.pdfIn PDF document text
    • https://dezusopivelisuk.weebly.com/uploads/1/3/4/7/134734284/vubazatefi.pdfIn PDF document text
    • https://xixozikitep.weebly.com/uploads/1/3/4/0/134097223/vutivogemuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481999/normal_602482867dd45.pdfIn PDF document text
    • http://senenetikoxikom.22web.org/83125217603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428052/normal_5fd13a0c07321.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/i2ifgQX/make_a_city_idle_tycoon_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gotoruzud/ieITXij/podowojamup.pdfIn PDF document text
    • https://patapirebitogi.weebly.com/uploads/1/3/0/8/130814085/wodiwujazezowi_voguto_wejuvulovefat_goxiwujuzamep.pdfIn PDF document text
    • https://www.br-equipment.com/sites/default/files/TXG-Compact-Series-Rotary-Tiller.jpg|https://www.brIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puzasapexuwuju.epizy.com/37378750327.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_off0000d3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DC 4600 bytes
SHA-256: b6b6cdb2667df8704efaf2d6971455b3737871e3e07764cb06f1a87f894dac51
font_01_sfnt_off0000e3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 10748 bytes
SHA-256: d743413fe8188dd8cac9d071fac6158cb322821d8a79d7d4a677e7d2e7915389