Malicious PDF — malware analysis report

Static analysis result for SHA-256 93704b426d500dd8…

MALICIOUS

PDF

77.5 KB Created: 2021-03-29 21:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62a0ad98c708f66629d9ceb90af08771 SHA-1: e9ebd0eddab1f9c930511abe00b18d2a7d3efa54 SHA-256: 93704b426d500dd890d08f2a15990c242bb4a82f0b8f06246cdb9525a510e4bf
156 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating it's a phishing or malicious PDF. The PDF contains a large number of external links, suggesting a link farm or a phishing campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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://resalured.ru/aws?utm_term=who+is+the+best+australian+chaser
    • https://sasominafa.weebly.com/uploads/1/3/4/3/134362810/timufizor-kowopogubuwun-jijudomevo.pdf
    • https://vinovubetiloj.weebly.com/uploads/1/3/4/6/134679092/d761378.pdf
    • https://jupikojeba.weebly.com/uploads/1/3/0/9/130968920/xagugupe.pdf
    • https://vinipuzi.weebly.com/uploads/1/3/0/7/130776781/885286.pdf
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/ladeza_pedaru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vogepaxita.rf.gd/how_to_program_my_cooks_coffee_maker.pdf
    • https://uploads.strikinglycdn.com/files/b992917d-df8e-4b20-8421-ae35aa9e0c31/lola_and_the_boy_next_door_audiobook_free.pdf
    • https://s3.amazonaws.com/sugowubuf/99655143098.pdf
    • https://s3.amazonaws.com/sefiwegegagu/29721744178.pdf
    • https://s3.amazonaws.com/kelukakeb/android_binder_ontransact_example.pdf
    • https://s3.amazonaws.com/wovitiku/xosiderulujewotil.pdf
    • https://s3.amazonaws.com/fojaxexino/surgical_wound_infection_antibiotic_treatment_guidelines.pdf
    • https://s3.amazonaws.com/lixisariwulo/75386234505.pdf
    • https://uploads.strikinglycdn.com/files/76c27800-1a23-4744-bf15-9120092655ef/nekinawovolefiwasa.pdf
    • https://s3.amazonaws.com/sesijesule/kajanawasedobofakiwegir.pdf
    • https://uploads.strikinglycdn.com/files/97a5f2da-d6d1-472c-8e56-43dcce238102/sevidej.pdf
    • https://uploads.strikinglycdn.com/files/921b8b4c-74a9-4560-abe1-9c1bf447a51a/vavemuvuxoperedo.pdf
    • http://fepesori.rf.gd/august_month_current_affairs_in_telugu.pdf
    • https://uploads.strikinglycdn.com/files/c13b9c5b-e7b8-42e6-95ed-58501b001a1b/how_to_buy_a_home_in_ontario_with_no_money_down.pdf
    • https://uploads.strikinglycdn.com/files/f27ae4db-2e9b-446b-b79d-6bbc149eef33/tifijodazob.pdf
    • https://uploads.strikinglycdn.com/files/aa342030-b5b9-42eb-87a7-566d02fef3b8/public_relations_internships_atlanta_summer_2021.pdf
    • https://s3.amazonaws.com/kiguteperilodu/79324826354.pdf
    • https://uploads.strikinglycdn.com/files/8670f8eb-ff93-4ddd-af17-8ebee268ea0f/68920917795.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_off0000f317.bin
9fa85024d460871033ad3eb52a1b350315d37aaeeb2896fb60d8539be5f30475
pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 5040 bytes
font_01_sfnt_off00010443.bin
f58831fd3432305b9ff8aac2d12822d2c5fc48c5e4b4198428432967cb5a1238
pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 10732 bytes