Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b80f5d4011c6d66…

MALICIOUS

PDF

81.3 KB Created: 2021-05-23 11:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0b98f5756bf4840e5775a621e53cd045 SHA-1: 2350820e7b46ac7dc93bca5594aaf9e27b36f7b4 SHA-256: 7b80f5d4011c6d66e2b7fa5b410a8a872f79470067b8fd9472dab5f23a6b4383
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain ('maypoin.ru') and a search term related to a service manual. Heuristics indicate a 'PDF_SEO_LINK_FARM' and a 'PDF_Phishing.Trojan' detection by ClamAV, strongly suggesting a malicious intent to redirect users to potentially harmful content. The presence of embedded links and the ML classifier output further support a high confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/strik?utm_term=viessmann+vitodens+111+service+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473926/normal_6063759cead09.pdfIn PDF document text
    • https://digakope.weebly.com/uploads/1/3/5/9/135974251/gedonanitezakeku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_6051002132300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451955/normal_606677ab9887e.pdfIn PDF document text
    • https://namokokesovu.weebly.com/uploads/1/3/4/4/134480524/tofesateluditazomuw.pdfIn PDF document text
    • https://lirabofopexile.weebly.com/uploads/1/3/4/3/134356775/8dd621f316a70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488103/normal_604d39879e93a.pdfIn PDF document text
    • https://turazuxutanuv.weebly.com/uploads/1/3/1/6/131606798/javovibedolewi.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/supefujoxopubu/kubodobanegome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a61c75e-ab58-4fef-8e41-473f3ca47e04/frigidaire_gallery_refrigerator_fghb2866pf_ice_maker_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00549fdb-d90a-4e78-a4b1-59f480f88676/53364021367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b08f2e-98b0-4d35-8ab1-97fb3ec656f3/39274864008.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/62292619430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fcaa1a4-4dba-4889-92af-23d9a623871d/xibefejesasalebowad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af08c277-d1c8-4aeb-8de6-ae98f2280abc/ziwowirubojavubuwoxagumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3444ecfb-aec2-4d81-9677-bc398866af4f/castle_creations_sidewinder_3_lipo.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/bullet_journal_2019_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52cae892-46b0-4595-9038-da186b86e683/why_does_my_furnace_limit_switch_keep_tripping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50764f99-499b-40d9-a0b9-82e4c5fb0beb/manuxojatufez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b42cbd5-1fe4-431c-892d-a62e1013f4c7/merriam-websters_pocket_spanish-english_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f17b3986-c148-47a1-b1a2-3954a335f9dc/livomukigefulumitukosat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69bc79cf-6895-4329-a7d7-47d48a59d719/87856222496.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 5160 bytes
SHA-256: 3ad49cf6318a38ed8e2e96e3166f7d6ba29e0fdb18155044d9ef589629d30ed0
font_01_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 10744 bytes
SHA-256: 752ad037db0883630ae475269982694f06e056f3f28de7a3f425f3ce57ace0b0
font_02_sfnt_off00012238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12238 16132 bytes
SHA-256: 267fa55b14ef4cf900efb316cf3a679441c5cb47c67db7c400ecf172ea91784f