Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bf69f1ec58c7b8…

MALICIOUS

PDF

92.7 KB Created: 2021-01-10 19:54:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5347af015e75cc1efa393ac70992557e SHA-1: b851e24e34066bf6c0de6a06804a670ff54ab5fd SHA-256: b1bf69f1ec58c7b854410c96af7ad2614b471765e438b5ec27943c37becb8938
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains or link farms, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of embedded URLs and the overall structure point towards a spearphishing attachment delivery vector.

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://trafftec.ru/123?utm_term=mr+marshmallow+modena PDF link annotation
    • https://cdn.sqhk.co/vifutetax/Sjg0je9/ultimate_car_driving_highway_simulator_hack_version_download.pdfIn PDF document text
    • https://site-1168129.mozfiles.com/files/1168129/ninja_hattori_fighting_game_apk_download.pdfIn PDF document text
    • https://site-1166597.mozfiles.com/files/1166597/rice_coal_stoves_for_sale_near_me.pdfIn PDF document text
    • https://gavawujag.weebly.com/uploads/1/3/4/3/134370084/nuvomebop.pdfIn PDF document text
    • https://wadazujirala.weebly.com/uploads/1/3/4/5/134596454/d548bd0.pdfIn PDF document text
    • https://mipabewezodif.weebly.com/uploads/1/3/5/3/135315693/187700e0d21eb.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuwene/heNNhdO/dibisamunuru.pdfIn PDF document text
    • https://cdn.sqhk.co/sadisadaz/hiou2ih/brothers_in_arms_3_apk_old_version.pdfIn PDF document text
    • https://site-1166067.mozfiles.com/files/1166067/fesusigeroj.pdfIn PDF document text
    • https://site-1171112.mozfiles.com/files/1171112/online_slots_real_money_no_deposit_bonus_australia.pdfIn PDF document text
    • https://sumigixutaruxaj.weebly.com/uploads/1/3/4/7/134748626/477d05fee5e7311.pdfIn PDF document text
    • https://site-1193425.mozfiles.com/files/1193425/vipakolobozotoki.pdfIn PDF document text
    • https://site-1177153.mozfiles.com/files/1177153/guardian_tales_guide_world_2_hide_and_seek.pdfIn PDF document text
    • https://gojenegitoz.weebly.com/uploads/1/3/4/3/134387591/8165944a377.pdfIn PDF document text
    • https://site-1209772.mozfiles.com/files/1209772/fotelerowebiturobokiboga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 6424 bytes
SHA-256: e637e929042e3978bec96b31b3490ba660419ed310d31d627162007a830036f1
font_01_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 5164 bytes
SHA-256: 5354a861a6d6a334db015ea0678415aabf722cb25f8e8bd37b82496f4a2e5952
font_02_sfnt_off00011520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11520 4844 bytes
SHA-256: 8823e39a169458557b1d02485615bae6f43c6a8f9b6af426c721376911186968
font_03_sfnt_off00012657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12657 11420 bytes
SHA-256: 84380fb36d375c6758edb7ec5bf0b1bbe99397d9e5d8193b9c5f72136346f4f6
font_04_sfnt_off00014b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B53 17428 bytes
SHA-256: 557d01a5f6f5969ed8d777e6a750a2f71658a61fff834b43d3b6bd8198e74b26