Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19c8684b12f950d…

MALICIOUS

PDF

80.8 KB Created: 2021-04-30 04:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ddb537ed34ca478e319c067c4a1bc7ed SHA-1: 21007b53fb345744fd8685218d2fc1c0d643ad6d SHA-256: b19c8684b12f950da97a69697a223bd9b59f536d3d3dd60b49b2d2108fb07bad
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to 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 embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lozipotod.ru/strik?utm_term=wahl+balding+clippers+amazon+uk PDF link annotation
    • https://balikawe.weebly.com/uploads/1/3/4/6/134659528/sorowubep.pdfIn PDF document text
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/7131654.pdfIn PDF document text
    • http://bilkan.fun/parasitology_free_downloadsl0nn.pdfIn PDF document text
    • https://sitawixabebel.weebly.com/uploads/1/3/4/3/134319036/800bd8.pdfIn PDF document text
    • https://cdn.sqhk.co/tirazirevemu/jahdfig/japan_taxi_coupon.pdfIn PDF document text
    • http://kelnoteres.xyz/microsoft_office_2016_tutorial_free_downloadga8uu.pdfIn PDF document text
    • http://prodson.fun/save_the_fish_vegetarian_sushi_kansas_cityg6u2y.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/hTkupsl/609627185.pdfIn PDF document text
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/dutiw_ralapuvuze.pdfIn PDF document text
    • https://cdn.sqhk.co/mekoposa/iavH1gd/63810267024.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/ig4jaia/nozatagupitak.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxeneson/if1hegi/make_ice_cream_half_and_half.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/i8LEgej/lelonol.pdfIn PDF document text
    • https://puzelosepe.weebly.com/uploads/1/3/5/3/135317481/6022869.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/YigZXzM/52451585863.pdfIn PDF document text
    • http://matteset-spon.space/mass_moment_of_inertia_of_cylindermkkgc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc5d543-874a-4f56-989b-65e55d704965/mupigesivonukeleganelod.pdfIn PDF document text
    • http://fedepor.rf.gd/schwinn_ic3_indoor_cycling_bike_weight_limit.pdfIn PDF document text
    • http://vomozenofeke.epizy.com/mimi_s_cafe_menu.pdfIn PDF document text
    • http://kuwanuzoniwod.rf.gd/77909308463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f58da49e-b3e1-4991-94a9-628f153dc2b9/7097464737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c5083aa-64f0-4063-ad80-8a32c9780d42/betty_crocker_picture_cookbook_first_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf798a4-38f8-43fa-b9f8-dfdcd1a326c6/practice_ged_test_indiana.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_off0000fbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBB 5752 bytes
SHA-256: 4ca9b618fe5785f178c28e88cf90ffea8c3146fb954c976c3b4f4113634b5248
font_01_sfnt_off00010f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F35 11560 bytes
SHA-256: abe2174906b1301e2c00b460f58ff407dc9a5166a0035f6d439d5c35f3ed7f7d