Malicious PDF — malware analysis report

Static analysis result for SHA-256 c770bd5571799f02…

MALICIOUS

PDF

77.1 KB Created: 2021-05-04 04:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 55b354bb8f745760648583fd628ce995 SHA-1: 46c729ecf3008142cfc21754d9619605946973d4 SHA-256: c770bd5571799f021a9240db5a6adde6af381d74390970b5692951059fc68aca
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 SEO abuse tactic. The embedded URL and the document body's reference to detective earnings indicate a phishing or scam lure. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+much+does+a+detective+earn+in+south+africa PDF link annotation
    • https://jujivonigipegi.weebly.com/uploads/1/3/1/4/131453429/6251935.pdfIn PDF document text
    • http://sq11mini.com/budget_approval_form_templatedxs4o.pdfIn PDF document text
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/fd73e80ad.pdfIn PDF document text
    • http://summerita.fun/chamberlain_liftmaster_garage_door_opener_troubleshootingcb71t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465938/normal_5fde2e597a13f.pdfIn PDF document text
    • https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/8121267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490122/normal_60461c9611afc.pdfIn PDF document text
    • http://rocketdocs.us/27128898336ivsuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372384/normal_6000ec925634e.pdfIn PDF document text
    • http://tricitysikhs.com/65440243440pcbso.pdfIn PDF document text
    • http://sexesex.site/how_to_use_ergobaby_360_with_newborn_insert3f6sp.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/77d53934-3d21-470c-a0f0-f4cf7bc08c35/99037479345.pdfIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_b14618637dfb4d41a0a3462b4da6130a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba0fc6ef-2f68-4f81-8322-5db903442f99/book_review_template_for_third_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e63bd0b-d348-47ac-b43b-db6e9b487264/hunter_douglas_powerrise_battery_wand_aaa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6e5370b-9d95-425c-89dc-ea2eb6b19904/dirt_devil_power_max_xl_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87bc1cbf-8c8b-4446-ab85-d3a7031b1a97/antenna_and_wave_propagation_balanis.pdfIn PDF document text
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_66a823bf92a94175b9eb2878ffa4bbd9.pdf?index=trueIn 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_off0000edf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF9 5344 bytes
SHA-256: 93350756999b7deb577fb3cba6c0f2e62629075bb7e203d774f454fce998b5e4
font_01_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 11060 bytes
SHA-256: 01974201c428d5d4983c5fa7512fdf79075799d754bcda9e04306fcd1f85c02f