Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9dc56c383e37f6…

MALICIOUS

PDF

93.2 KB Created: 2021-02-28 05:25:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0a6b6b404188ffb26453171f77fe914c SHA-1: 46d34b263bd42954996cc26fd6441086c40cffb6 SHA-256: 3f9dc56c383e37f627d7c3b335a00badc805fe1e001f6f6ad230baf2af27b878
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The primary URL points to a search result for 'best buy portable air conditioner with heater', indicating a lure to drive traffic to potentially malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/strik?utm_term=best+buy+portable+air+conditioner+with+heater PDF link annotation
    • https://cdn.sqhk.co/wopidaxiwuk/Cgdhgjf/numudu.pdfIn PDF document text
    • https://pupowoxixibigi.weebly.com/uploads/1/3/1/4/131438439/9e27a55d020a886.pdfIn PDF document text
    • http://airned.ru/def_of_obsolete_informationoqsjd.pdfIn PDF document text
    • http://afracheat6.xyz/nizemolifofuhi7p.pdfIn PDF document text
    • https://sajulivos.weebly.com/uploads/1/3/1/1/131164476/zoronetun-xutiku-jutobisuzujalaw-poledad.pdfIn PDF document text
    • https://cdn.sqhk.co/netimupoxojo/HqhfW3d/guguluguwa.pdfIn PDF document text
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/rifedi_vuzumupe.pdfIn PDF document text
    • http://unreguezff.rest/briggs_and_stratton_carburetor_parts_canadian_tire94pwd.pdfIn PDF document text
    • https://penebiji.weebly.com/uploads/1/3/5/3/135346042/xireziwita.pdfIn PDF document text
    • https://cdn.sqhk.co/katutilit/icifUhg/extreme_car_driving_2018_drift_simulator_mod_apk.pdfIn PDF document text
    • http://pasetbs.xyz/185092175441nwkr.pdfIn PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/roxitirutomivup_wesuwolozike_lurim.pdfIn PDF document text
    • https://lafozevu.weebly.com/uploads/1/3/4/3/134378288/8161889.pdfIn PDF document text
    • https://rodibafabe.weebly.com/uploads/1/3/0/7/130738722/9203405.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467287/normal_5fde3acbedc96.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/zesixefe/icloud_photos_from_iphone_to_mac.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F3 5544 bytes
SHA-256: 989e2ae33f962e4e18cbe85e963d1fc46554bf2735348d366e523d00819dae1d
font_01_sfnt_off000146d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D4 10920 bytes
SHA-256: 4680fa572a1af9ff8136afcc5b4a3a3c5ccf20631615d7df9c32c936d4b20973

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