Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa456a484b432151…

MALICIOUS

PDF

80.6 KB Created: 2021-03-22 08:20:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0c98b78116e394b4b39cd825d09010e5 SHA-1: ba6bb63a8b69a3f2042dd42dabe5dc43a08aa685 SHA-256: fa456a484b432151131cf5335ea642b16e1f754951dc28dc6567760e471c0b71
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and appears to be junk data, further supporting the malicious nature of the PDF.

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://resalured.ru/award?keyword=cfit+skala+3+pdf PDF link annotation
    • http://kifejuja.medianewsonline.com/the_body_book_roz_maclean.pdfIn PDF document text
    • https://cdn.sqhk.co/nawamuzimosu/hdjdjjA/turufedivapotajubizejab.pdfIn PDF document text
    • http://pukebebizadolu.mypressonline.com/access_control_installation_training.pdfIn PDF document text
    • https://gidixelasulam.weebly.com/uploads/1/3/0/7/130739099/8234634.pdfIn PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/b7c1023e.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/18yKgji/60437001269.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/52953095332.pdfIn PDF document text
    • http://wonozudobitisog.scienceontheweb.net/toro_ecx_sprinkler_manual.pdfIn PDF document text
    • https://sevisexabokiro.weebly.com/uploads/1/3/1/6/131637038/magewemujurobizorigo.pdfIn PDF document text
    • https://burekanokem.weebly.com/uploads/1/3/1/0/131069897/sedatuwefawobep_nolafajago_xipiwogaxuwek.pdfIn PDF document text
    • https://vizazifikoj.weebly.com/uploads/1/3/5/3/135327449/wovimuvigamuvuw.pdfIn PDF document text
    • http://lebepufu.mypressonline.com/molecular_diagnosis_of_genetic_diseases.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/93240650496.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://segimoto.myartsonline.com/application_octet_stream_to_online.pdfIn PDF document text
    • http://bomemab.epizy.com/pivobusorubikuz.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_b5865fa2314f47f89e5be9dd193aa099.pdf?index=trueIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_9f7cdfed36b644889ecebd415ab15073.pdf?index=trueIn PDF document text
    • http://kolowesusudidib.rf.gd/ham_radio_frequencies.pdfIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_0c36a43e5e404eca8d9724e06e8d9577.pdf?index=trueIn PDF document text
    • http://niroregamoguda.epizy.com/89721286760.pdfIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_734802f28f9749e98043e4378ad0a0a2.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_off0000ff96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 5072 bytes
SHA-256: e7d4752c5ce65767cb22597c92d439614bc7d90965430b98caf08dec0ec4d4d3
font_01_sfnt_off000110f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F3 10720 bytes
SHA-256: 3b09866ae7adbca81bd2abbd3a8753ed779273bd4afce06d539f6e97da99aff7

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