Malicious PDF — malware analysis report

Static analysis result for SHA-256 451dd6fd54d2c4fa…

MALICIOUS

PDF

83.0 KB Created: 2020-11-18 03:53:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d6e6e504032e5568ae250c94ca2c0544 SHA-1: 374601f455dbd2f312d0d10a83f0e51da003c88e SHA-256: 451dd6fd54d2c4fa5749b24af1f70ffc244a33a991e12fc3ea8c3488a8ee4276
244 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link farm. It contains numerous embedded URLs, with at least one pointing to known malicious infrastructure. The primary purpose appears to be to lure users to malicious websites through a deceptive link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/aws?utm_term=certified+ethical+hacker+pdf+v10 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f8ab128811c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_5fb459224ce1c.pdfIn PDF document text
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/7cea55df.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/7116780.pdfIn PDF document text
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/sulenit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5f99e8465cd61.pdfIn PDF document text
    • https://mujonesaxofifi.weebly.com/uploads/1/3/4/6/134680030/a7603f347a79.pdfIn PDF document text
    • https://zuzilenew.weebly.com/uploads/1/3/4/5/134527977/fitigi_sajitog_marojewomeko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/df0871a6-d317-4a95-a5c3-c72643898387/59209702473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf7d217-89b3-44cb-aade-e1b850d97b14/badewowizavajulodu.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/aggressive_driving_behavior_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5204a03-0565-4274-b9ba-a66602865f8a/84063677444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ba69b8-654f-4867-a6eb-cbc8883fe9f6/86857829191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c47eb2-fdbe-4c25-8901-d3ddf61a7283/37426551316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d6601a-650f-428a-89db-2453ac6a09ee/download_roms_gba4ios.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/15027631606.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE6 6868 bytes
SHA-256: 6019cde28b6ea467960cb9061d946eba2e6f6e329441c5f9c70165ddd1b66b58
font_01_sfnt_off0000d041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD041 5288 bytes
SHA-256: a35407319afc9c2890c10eefc8e3aceef4cf4de8ddf3cd4a4852cd332860192a
font_02_sfnt_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 9872 bytes
SHA-256: df20b1d189aefc6202674380eff7bd4947bf169988a77d20ab4f601867f4078e
font_03_sfnt_off000101c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C4 11212 bytes
SHA-256: 853fcc7ef9ff78a1200900df6f851b82aa2586383fb5e601bbbf51421881f0c9
font_04_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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