Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02518923f715a00…

MALICIOUS

PDF

67.7 KB Created: 2021-03-09 11:32:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d1d503f14de5ed697c91d94cd79b4d0 SHA-1: 960a1bef5983001e6e39c5086bee112d287b24bf SHA-256: b02518923f715a002dfd967a3dacc4356f3a22ec0b5ac0b971da6e988252dcac
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://vilenefex.ru/123?utm_term=electronegativity+probable+bond+type+worksheet
    • http://startbastar.online/427972488548u2tj.pdf
    • http://nogurufegu.mygamesonline.org/atari_flashback_7_power_supply.pdf
    • https://tosoremekik.weebly.com/uploads/1/3/4/7/134771766/e167d.pdf
    • http://zekaxezixil.medianewsonline.com/momo_traders_amazon.pdf
    • https://cdn-cms.f-static.net/uploads/4484820/normal_6034d4fb7218b.pdf
    • https://dedelazixuni.weebly.com/uploads/1/3/4/5/134596723/mikeveruzoj.pdf
    • http://inostrana.com/idle_arena_clicker_heroes_battle_modooaa5.pdf
    • http://sale50.pro/52141080120ea3vd.pdf
    • https://gemiletux.weebly.com/uploads/1/3/2/6/132681217/fe34c367ba2ee95.pdf
    • https://cdn-cms.f-static.net/uploads/4417033/normal_6037021210f66.pdf
    • https://static.s123-cdn-static.com/uploads/4369165/normal_5fe4e0d7b6b08.pdf
    • https://neseveroxikiz.weebly.com/uploads/1/3/4/6/134603771/potevakefutu-kivip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/loneminovu/api_570_piping_inspection_course.pdf
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_37b8ca4cb54e402a95ddc01f11bd24e8.pdf?index=true
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_b5f0a88721ea46fcb154f8db1f0ac7d9.pdf?index=true
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_4a45180798294493815fb9afa8817538.pdf?index=true
    • https://s3.amazonaws.com/sugowubuf/what_is_a_mental_strength.pdf
    • https://s3.amazonaws.com/sifawekujiki/what_kind_of_oil_does_a_2014_jeep_grand_cherokee_take.pdf
    • https://s3.amazonaws.com/wiremeresegikon/iphone_app_store_history.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb98.bin
0346fd16d06cd449c7dea3d78cac5978a3b92ec8a0f118de22e65bc76358be0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB98 5752 bytes
font_01_sfnt_off0000df42.bin
bd978c1547c81820f94a880c04430dddf3c5e0f24b19bfcc690db7803bf84522		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 10168 bytes

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