Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0389e9adab035aa…

MALICIOUS

PDF

68.7 KB Created: 2021-05-28 21:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7a123e6208592654e16e4e83aa62281f SHA-1: ec2d0cee9f715dd6f4399b1fd5c5477c1c76e64c SHA-256: a0389e9adab035aae89a407a6b91864cef837da43d81e39bd6fce69d97b237bf
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, identified as a link farm, hosted on numerous disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. The embedded URL 'https://xezojetit.ru/123?utm_term=asymmetry+of+information+insurance' is a primary indicator of the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/123?utm_term=asymmetry+of+information+insurance PDF link annotation
    • https://debovibeki.weebly.com/uploads/1/3/4/7/134715081/peronapimudivodud.pdfIn PDF document text
    • https://wininivawad.weebly.com/uploads/1/3/1/4/131483201/442209.pdfIn PDF document text
    • https://zolopopi.weebly.com/uploads/1/3/3/9/133999976/6204526.pdfIn PDF document text
    • https://sunivisoxeban.weebly.com/uploads/1/3/4/4/134493344/mokidazifigemoze.pdfIn PDF document text
    • https://kuginipa.weebly.com/uploads/1/3/4/8/134853520/125642.pdfIn PDF document text
    • https://zifatajute.weebly.com/uploads/1/3/1/4/131438038/47f21.pdfIn PDF document text
    • https://wokiliga.weebly.com/uploads/1/3/0/8/130814475/xenuwewepipirizuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484122/normal_6018e606d4c79.pdfIn PDF document text
    • https://fozunisomizu.weebly.com/uploads/1/3/4/6/134666093/45738.pdfIn PDF document text
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/tifavofat_doger.pdfIn PDF document text
    • https://nanuleseja.weebly.com/uploads/1/3/4/0/134012971/4db322519f9f4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484820/normal_603f39a9d0b71.pdfIn PDF document text
    • https://nefakemibozike.weebly.com/uploads/1/3/5/3/135314079/jagesosilanogu-nozefimexulutul-kilifubukekepon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485457/normal_5fc7abc65a067.pdfIn PDF document text
    • https://vuvunovugigadi.weebly.com/uploads/1/3/0/8/130814714/dolunifu-rivemaxovesabol-xitage-gopisu.pdfIn PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/zedivelukudi.pdfIn PDF document text
    • https://bodovusinorone.weebly.com/uploads/1/3/5/3/135347185/vijoterojumar_sotozagun_vazuzitudililem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5fdb92a24c251.pdfIn PDF document text
    • https://xodalolekuxol.weebly.com/uploads/1/3/4/1/134108590/nimuzawemapakobed.pdfIn PDF document text
    • https://zadevadetolilug.weebly.com/uploads/1/3/5/3/135321342/sogomojajajixil.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/b336a655-4769-4a22-b398-092459b3c5dc/govezomuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9dd574e-4045-4806-a5f5-ab985a90de52/63669314844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbec95df-b059-47b4-a021-9a1c90005b4b/83963215259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b21197-333e-40b7-8033-c8b5a24a7535/dexesugaximosuwodulul.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06A 5084 bytes
SHA-256: 66608c6bde92b8eed66a08aff8c42a19d3533841724dc1760dd47c4d5e2fb795
font_01_sfnt_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 9940 bytes
SHA-256: 956c83bd5fba9ae9522df1aa70dc013252796efeb45408d1e415cdf9890757b0