Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc138f84d6684ac3…

MALICIOUS

PDF

76.1 KB Created: 2021-05-25 04:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 94a87b155e701e0bad4a3060c54a6531 SHA-1: ded9d3467f53e9441e407c8ae48c09de531dc874 SHA-256: cc138f84d6684ac36a40a739119947cda3f50e37e3db1aabab06634012d494d6
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/strik?utm_term=ignou+mcom+2nd+year+solved+assignment+2020-21 PDF link annotation
    • https://fekoguto.weebly.com/uploads/1/3/4/4/134491689/mimesusa.pdfIn PDF document text
    • https://xonutupusuvulin.weebly.com/uploads/1/3/1/8/131871786/fd8c912c.pdfIn PDF document text
    • https://vutuwoti.weebly.com/uploads/1/3/4/7/134720014/2753609.pdfIn PDF document text
    • https://jesomufufasak.weebly.com/uploads/1/3/1/8/131872286/7636043.pdfIn PDF document text
    • https://vekaforu.weebly.com/uploads/1/3/4/7/134747957/2657339.pdfIn PDF document text
    • https://nanagufema.weebly.com/uploads/1/3/1/4/131483019/jazobatorabupuk-tamevi.pdfIn PDF document text
    • https://rupibofog.weebly.com/uploads/1/3/1/6/131607232/gazapof.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/d0b436f2-9db3-4923-88bc-d6c034a5b6be/kodupojobivinipefisero.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/free_honorary_doctorate_degree_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/517c3169-6627-409c-a4de-4cdd76415fd8/freund_walpole_mathematical_statistics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84eb66c9-bda3-43c0-8a01-d7a98be37cd5/wefipoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7efca063-579b-490d-b063-1f87de90911a/amazing_grace_my_chains_are_gone_lyrics_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b23924b7-654f-45d7-a797-228b71cebcb4/93070072494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10271b94-624c-49ba-a025-c1b718118020/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ae6c9b4-14df-4b8e-aa32-30c934652cb0/995422983.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/75174391226.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/38119074670.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/paxomoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a350f8d-b8fe-48dd-a166-db4f46af3018/canon_mx300_driver_mac_sierra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/457fcbcd-538c-42d5-a72d-1b1895047be3/how_many_calories_is_a_krispy_kreme_donut.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/5918867239.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_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 5716 bytes
SHA-256: 7597f971ae5de762d22aa245ae7ae357ca18e265fb4ae8b9c58189d4a15fef70
font_01_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 13340 bytes
SHA-256: 92b2b4c80a3d44dfb7a622a74a31c347f27e919ea62a01bdda96995d1df5374b