Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36963b09794965e…

MALICIOUS

PDF

74.5 KB Created: 2021-03-25 14:02:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3267e4bc5ed8dbf8491cb88115983eae SHA-1: 16cef66236952b23269daaaf1ea9a7c9e972d4a8 SHA-256: d36963b09794965e3ccf32f306b6a8f704fc7b779a8940f89c1400af71958da5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://golowaki.ru/wix?keyword=ngoc+rong+online+doi+mat+khau PDF link annotation
    • http://persequen.com/canon_mg3122_printer_ink21fed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368978/normal_5ffc21d505e79.pdfIn PDF document text
    • https://muxililepojas.weebly.com/uploads/1/3/5/3/135344509/keson-tozimedoloj-sogoworag.pdfIn PDF document text
    • https://wixezijuni.weebly.com/uploads/1/3/5/3/135312108/21292.pdfIn PDF document text
    • http://spencermcman.us/dapumazanupuxowanowanopefl5wn7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_605a4b11461e7.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/7448761.pdfIn PDF document text
    • http://disozire.mygamesonline.org/89371150976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5fd9185a21411.pdfIn PDF document text
    • https://gakokoxexoboj.weebly.com/uploads/1/3/0/7/130776672/4580120.pdfIn PDF document text
    • http://blaugrana.ru/don_juan_canto_10_summarygvmhi.pdfIn PDF document text
    • http://specrazreshenie.com/best_usmle_step_1_prep_course_2020nn4ni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414860/normal_602d25a4d1360.pdfIn PDF document text
    • https://doxezasofe.weebly.com/uploads/1/3/6/0/136088479/8350376.pdfIn PDF document text
    • http://fragcups.com/milutuvopau1r2r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_4cd163929ee44378af17ee1fd16e7a9b.pdf?index=trueIn PDF document text
    • http://paguxesij.myartsonline.com/bill_nye_energy_answer_key.pdfIn PDF document text
    • https://3012fa3b-51b7-4264-898e-e15d6fab1eb1.filesusr.com/ugd/ee5524_964b219c2ab9431f9caec449aed3303d.pdf?index=trueIn PDF document text
    • https://9cc03a5b-da86-4a44-8f3d-15f7580f9586.filesusr.com/ugd/cac91c_06971d43e9a14e3f9b05d5f1e18f24dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fofeguj/kizejowa.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/how_to_connect_to_wifi_samsung.pdfIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_e4fc36aa981b43deaf9ffa11fbd420da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dagasopones/jabelekimuminufawabojas.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_off0000d7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CE 5208 bytes
SHA-256: eff25da71e2bfe97986d0ebaacb1512c7768c615bca0155b729fadbb824ace61
font_01_sfnt_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 21148 bytes
SHA-256: 81ddd25ece84a5c9c5836fd05878d395f7deadb322464cbba2b5d6ab0b64a8f3