Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb28903453ab70a…

MALICIOUS

PDF

79.6 KB Created: 2021-03-22 04:17:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5ee6824401ebe9726e32e0571a23939e SHA-1: 5cfab382e857b42f9f501288ea8a927ea15a41b6 SHA-256: 8bb28903453ab70a53d3662cd68aa443400936cb5fbf1737d56b2f1fcba16515
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to redirect users through multiple disposable domains, likely for phishing or malware distribution. The presence of external URIs and the overall structure point towards a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://resalured.ru/123?utm_term=memu+emulator++for+windows+8.+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411512/normal_6003add73287c.pdfIn PDF document text
    • https://paxolobiwoke.weebly.com/uploads/1/3/1/1/131163878/gidobogawos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484993/normal_5ff3cd93dba72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461773/normal_5fde43ea30547.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419195/normal_604a9175cc14d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_5fd3dcde3d886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475999/normal_601ce2be8e1f9.pdfIn PDF document text
    • http://gawuguvososu.iblogger.org/lineare_argumentation_schuluniformen.pdfIn PDF document text
    • https://bewogataxatux.weebly.com/uploads/1/3/2/6/132695278/lijoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_602355e1a05f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464541/normal_602ed0769e158.pdfIn PDF document text
    • http://kosiwixiwumizu.iblogger.org/how_to_use_a_master_forge_electric_smoker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484807/normal_602aebda3bc02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_600d901649ab6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuninedup.epizy.com/feasibility_study_template_word.pdfIn PDF document text
    • http://filazit.epizy.com/committees_in_congress_answer_key.pdfIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_3424affd49d942f38d1b5ec2a5e3466c.pdf?index=trueIn PDF document text
    • https://ea0a6730-5b47-42bc-899c-5b27b21b32ea.filesusr.com/ugd/184298_a5bd5adceb9f4c0080c911ab36286455.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b5c262e-603e-4622-9bc1-cef736ab8b43/60513337205.pdfIn PDF document text
    • http://xetezonosilu.epizy.com/22926182862.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_09f8a16ea8fd44dfa409fb1764c07a7f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9daeb95c-5f5f-4e55-b150-5d9e0344ebfb/how_hard_is_it_to_learn_egyptian_hieroglyphs.pdfIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_6a1fdd0d30994bf9aa501d3526c4c579.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e55914a5-bd87-4bed-a52d-c1d05a4aa362/why_is_my_kenmore_elite_washer_not_spinning.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 5428 bytes
SHA-256: 7d34f3401e70f10fcce01cd83b3ac9b3e12e85dfb8aaf7b2522973718c65ddf8
font_01_sfnt_off00010252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10252 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 10948 bytes
SHA-256: 176d3b5867ba1ff2f1100562abe03233d46d90bc0626db3a9bdbc7387b24e443