Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f156a04ff6fdedd…

MALICIOUS

PDF

67.1 KB Created: 2021-03-08 11:32:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: db1188f5ac5e0e40bd57435d2b738509 SHA-1: c6a02f558f07d0e4099c870229fe818fae5acc39 SHA-256: 7f156a04ff6fdedda9cd4650ea71f84d06be3595ac13ef4a982914382ad456f0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. Heuristics indicate a mass of external PDF links and disposable hosting, with ClamAV detecting it as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. The document body is heavily obfuscated and unreadable, but the presence of URLs like 'soxebez.ru/award' implies a deceptive pretext.

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://soxebez.ru/award?keyword=mean+value+theorem+exercises+pdf PDF link annotation
    • https://tepupareta.weebly.com/uploads/1/3/0/8/130814680/a48edda984ce4.pdfIn PDF document text
    • https://nebakeji.weebly.com/uploads/1/3/4/6/134649015/38a5ed1f.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/hp_8620_printhead_replacement.pdfIn PDF document text
    • https://galafibokuwi.weebly.com/uploads/1/3/4/8/134868726/taposojaweguboj-rasolavenewo.pdfIn PDF document text
    • https://jufopikigon.weebly.com/uploads/1/3/4/3/134309667/kedaw.pdfIn PDF document text
    • https://lojavexir.weebly.com/uploads/1/3/5/9/135963097/daromogonex.pdfIn PDF document text
    • http://devicesprotectionforusers.site/panoxibizexabwvt0x.pdfIn PDF document text
    • https://vazatevetag.weebly.com/uploads/1/3/0/8/130874289/finabasukeg-tojafusaxena.pdfIn PDF document text
    • https://mizemajawoxulu.weebly.com/uploads/1/3/1/4/131437858/1691966.pdfIn PDF document text
    • http://italiabeach.space/14016083360astye.pdfIn PDF document text
    • https://zukujiwad.weebly.com/uploads/1/3/4/4/134491014/8308341.pdfIn PDF document text
    • http://diluzadumavotux.getenjoyment.net/kegite.pdfIn PDF document text
    • https://kalogipewaga.weebly.com/uploads/1/3/4/5/134595512/2721887.pdfIn PDF document text
    • http://islemleriniz.org/nigiwefusupusabojuvefafvcngu.pdfIn PDF document text
    • https://vivifaxokuz.weebly.com/uploads/1/3/4/5/134511129/kezunixezapesijefuxi.pdfIn PDF document text
    • http://netzamka.ru/222923250420qh5t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/7566934054.pdfIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_8d56da6fb2b24193bfaa3b6d68acf94f.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_c9eed86c0388422d86962c62e05ca243.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/waiting_for_godot_text_free.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/dexalijo.pdfIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_1824b20f42264e3780d456da64ae1a1c.pdf?index=trueIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_bbcb8a64d23b40ca8cc9844646e0219f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/72145635137.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/74546256528.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_off0000cab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB9 5528 bytes
SHA-256: 6548c747f1c5da00a50b4ee4ecf8b3a49c07103f23fc833b0b4354aa847717b9
font_01_sfnt_off0000dd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 9768 bytes
SHA-256: 99adae77cd6b13dfc68455dc4b94124348e8efc8b8e7bd140af61d3610094879