Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f536708cff2a27…

MALICIOUS

PDF

74.8 KB Created: 2021-05-11 05:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 84001bda9532e5c9c2f348ac64075982 SHA-1: b7cf994ee177f4cacce2f8d3440e9a615802007a SHA-256: 58f536708cff2a27858255ef69f932e9ac2d419728cfffb7387195d37675f312
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=singer+4423+guide PDF link annotation
    • http://xtw2.club/recharge_metro_card_online_new_yorkjzu5d.pdfIn PDF document text
    • http://hotgirls.host/why_does_my_hunter_fan_light_blinkqaubn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486548/normal_603b03f84c6ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_6055a1df9726a.pdfIn PDF document text
    • http://uchebnoe.website/sopelimegawogesewazunhcag3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poruworetizilu.epizy.com/midland_gxt1000p_manual.pdfIn PDF document text
    • https://f414df59-d0c5-412c-8277-160bd92acc6e.filesusr.com/ugd/055bb3_533da14540ad479dbbbe8a7e852270f6.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_5005d33b886e412ba6b813866cdee5eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatisake/66992496707.pdfIn PDF document text
    • http://sakunesazodi.epizy.com/18585996703.pdfIn PDF document text
    • http://puzexexaniledow.epizy.com/sidetiperosifo.pdfIn PDF document text
    • http://puwevaladimeve.epizy.com/soniwajolojefoj.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_6c055e957adc43f9969d7f3e95ec83b6.pdf?index=trueIn PDF document text
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_b7bd8df421a941d3bbd7c13ec37e9d73.pdf?index=trueIn PDF document text
    • https://8d9f32f1-468a-4e6e-8fd0-236262902e57.filesusr.com/ugd/28860c_16263cb77d7a4967a4f32535665a110d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/metformin_overdose_icd_10.pdfIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_f725a8d0dfcb4f03a4ddb61432ddc7a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fivebo/application_architecture_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/43988658437.pdfIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_aa01925345884abbb9dab976001b50fb.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 5060 bytes
SHA-256: 7366d84fb35b4ce8b6bc24f401e058d9c419f5d970342909406d9ff1fc06cf2b
font_01_sfnt_off0000fadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 10464 bytes
SHA-256: d934b57cf1194110b69d4dca2aabd885e7a2cb34b5a8501889a3f1f9f5800483