Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd6bda21569ec3b…

MALICIOUS

PDF

74.8 KB Created: 2021-02-23 23:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2218ab3c1c95247e4926a214aaf69686 SHA-1: ab602e2f515e0bef5390352774b4276409111d25 SHA-256: 1bd6bda21569ec3bcd6f34caa7e40dacf160248228295cb13fcdd3afc435dfaf
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary link pointing to a known malicious redirector. The heuristic firings indicate this is a malicious redirector and a link farm, suggesting the document's purpose is to drive traffic to potentially malicious sites. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=hdhomerun+prime+6+release+date+2020 In PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/jhjjIh3/capitalism_vs_socialism_vs_communism_cows.pdfIn PDF document text
    • https://waxukazo.weebly.com/uploads/1/3/1/0/131071095/rabisukam.pdfIn PDF document text
    • https://sawotulexude.weebly.com/uploads/1/3/5/2/135298589/c8e632b06a.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/hf6kibx/lezidunopabugopo.pdfIn PDF document text
    • https://losarofimet.weebly.com/uploads/1/3/1/3/131384333/2e5b1a558.pdfIn PDF document text
    • https://cdn.sqhk.co/lagazowasobo/h5hghe2/91503835941.pdfIn PDF document text
    • https://cdn.sqhk.co/posaleren/ajehd8v/tizulapolagavikebajigi.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/e1ab63314e736.pdfIn PDF document text
    • https://cdn.sqhk.co/vomawoko/ajg0pid/16281086334.pdfIn PDF document text
    • https://cdn.sqhk.co/tepikipo/hhMEigo/zubadilusivigusarer.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
    • https://s3.amazonaws.com/dosipive/kenmore_elite_washer_problems_recall.pdfIn PDF document text
    • http://zelogano.epizy.com/juwelufatidujek.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/baxukutadurofawezilodokig.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/16113038322.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/buku_pendidikan_agama_islam_kelas_xi.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/sezeridisevinowitakonu.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_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 5472 bytes
SHA-256: d8ef4ba5efe1ca93c0ce26781a0ee8082722703111fdbe1c2f973f105b7d9963
font_01_sfnt_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 11052 bytes
SHA-256: 9ae0ff159ccbcb17c7db5d36a6c2b27e2003c268451fb8384dfdc1c3b5134009
font_02_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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