Malicious PDF — malware analysis report

Static analysis result for SHA-256 5031ea213c91d4a2…

MALICIOUS

PDF

66.2 KB Created: 2021-03-12 14:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 86c277ef7b37e7cb8331bac750515736 SHA-1: ecfcd37a9d3f1f5b01ecb0d42e146057171e4ca3 SHA-256: 5031ea213c91d4a202cd578fac3bfbcc3a794bcbec069dee409d5cb6f875fcac
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of embedded links suggests a phishing or redirection attempt to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=kidde+co+detector+manual+kn-copp-3 In PDF document text
    • http://jojonavakuxuf.iblogger.org/bloodborne_chalice_dungeon_boss_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/todiwapubu/jjYHbgd/wipukebapi.pdfIn PDF document text
    • https://kupejofep.weebly.com/uploads/1/3/4/5/134589233/8242320.pdfIn PDF document text
    • https://xakirajurupani.weebly.com/uploads/1/3/2/3/132303083/98c89d0a6e77e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369640/normal_6004567c9223c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365576/normal_5fcd1d07a46a7.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/d4idhjd/slack_stock_price_target.pdfIn PDF document text
    • http://pobijubak.iblogger.org/11678606362.pdfIn PDF document text
    • https://cdn.sqhk.co/susorajin/gfLlXgd/guidelines_for_making_gelatin_salads.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467273/normal_5fdd47bb97a1b.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/3Ajahfh/super_discount_pharmacy_phone_number_plant_city.pdfIn PDF document text
    • http://javofekuniti.22web.org/how_to_negotiate_to_buy_your_leased_car.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/IUijR3f/tikitoxexozel.pdfIn PDF document text
    • https://fiwaxajosikevi.weebly.com/uploads/1/3/4/8/134885015/6683999.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492259/normal_6001d1ceab7cb.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/bd0ef593-6dfb-4041-949b-dc97e3541c9b/how_to_install_dymo_labelwriter_450_twin_turbo.pdfIn PDF document text
    • http://dinisevorodak.epizy.com/miwegofizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4601202-25dd-4172-89b3-9f28b27d902d/batman_new_52_goodreads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c279bc95-90ad-47c5-ade0-e5dcf28b82ca/goat_simulator_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68bc8aba-3039-4013-8685-5a99b7f87d93/3524581757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6cc44cd-f0d2-4122-b9d3-e6efc941ea07/essays_and_poems_by_ralph_waldo_emerson.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_off0000c7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DF 5272 bytes
SHA-256: 31b735e48fa06091c614b6a4276c24f660a7cde103c6d45986bdd20fd179053c
font_01_sfnt_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 9864 bytes
SHA-256: a449c3a5a4f43ec629f74fb49e8fa8c734b66248c463f4cbc51cecaa905278d4