Malicious PDF — malware analysis report

Static analysis result for SHA-256 071cc9e1bba691e2…

MALICIOUS

PDF

86.5 KB Created: 2021-03-30 04:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2fc867e7f9520cad3700d3a22a855023 SHA-1: 505be5286407819e5d664285995336eedcadddcb SHA-256: 071cc9e1bba691e2576c5b83690ae720507cb9a78d8367c73ff977fae02ff19b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO spam or a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The primary function appears to be redirecting users to potentially harmful content via these numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jottigo.ru/award?keyword=short+stories+in+telugu+pdf+free+download PDF link annotation
    • http://logorag.22web.org/30714302759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382418/normal_604c9f310e9fc.pdfIn PDF document text
    • https://cdn.sqhk.co/nesuxozajek/jcLhc3Y/vubigolepububoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_5fda4a0bb719b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_6044c969c1c27.pdfIn PDF document text
    • https://cdn.sqhk.co/retakabif/QrhTjiE/boo_2_soundtrack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_604956f733a5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_60567b357de2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417213/normal_60329f1603454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420761/normal_5fdc4859e13b9.pdfIn PDF document text
    • https://cdn.sqhk.co/faserekino/gfihdH3/86035721066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469126/normal_600b704aac898.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/ricVVlW/ding_tea_athens.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/39ueiii/54119815398.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498376/normal_6047c9c779c1b.pdfIn PDF document text
    • http://sezituza.66ghz.com/21756915396.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://minapisifiret.rf.gd/85369955369.pdfIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_db6186527bc445b7a9c6f3582343acc7.pdf?index=trueIn PDF document text
    • http://pitikepaz.epizy.com/90330031758.pdfIn PDF document text
    • https://c948e902-2437-43f3-9f1e-7aaad30688a7.filesusr.com/ugd/464a75_45a5cb424e634c8997419e2462dfcac4.pdf?index=trueIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_42c84c515e8d47c2994bd6e26effd8bc.pdf?index=trueIn PDF document text
    • http://bumojito.rf.gd/80897995497.pdfIn PDF document text
    • http://nenutufap.epizy.com/welizef.pdfIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_6e6e5c7560074a7687c81a505f94bb9a.pdf?index=trueIn 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_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 5380 bytes
SHA-256: 70d4d1b6d15b70781c9940447174be7aae7f09592f504e887901c5eeb0a76fd4
font_01_sfnt_off000119a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A8 10668 bytes
SHA-256: 2a38d4709fba5f2cea4bc74dd3a616edab90abd5f11629fa250be1025e10d721
font_02_sfnt_off00013e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E18 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2