Malicious PDF — malware analysis report

Static analysis result for SHA-256 d979ea38f9840747…

MALICIOUS

PDF

86.4 KB Created: 2021-03-14 10:17:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 93071f15a9d91c2244ebd1ad04994e94 SHA-1: 59116cab2be307a37f2588e7ce775bc46cd7d857 SHA-256: d979ea38f9840747adb3bf95f830c35aa49953757a6ae06a501a5505825a6a33
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by both ML classification and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains references to 'Google docs pdf comments' and the authoring application 'wkhtmltopdf', indicating a potential lure. The presence of numerous external URIs, including those on potentially disposable hosting, supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://golowaki.ru/award?keyword=google+docs+pdf+comments PDF link annotation
    • http://hightrade.club/raxubeleluumqqb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485942/normal_5fc7ad6d3fad3.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/2601885.pdfIn PDF document text
    • http://goodsun.fun/250865831434gmbs.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/fCjhhi2/godixolegofudiwomaro.pdfIn PDF document text
    • http://temilops.xyz/1721763727vwbil.pdfIn PDF document text
    • https://cdn.sqhk.co/garisuvonuk/dja3hhd/converting_percents_to_decimals_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451766/normal_5fe4155a26822.pdfIn PDF document text
    • https://rupusuji.weebly.com/uploads/1/3/4/8/134878943/aa2b55ff42df981.pdfIn PDF document text
    • http://deutschebank-meine.com/nuzadoperenuwezatatijenrco37.pdfIn PDF document text
    • https://cdn.sqhk.co/vefomatakin/gfD1ifg/domino_theme_party_decorations.pdfIn PDF document text
    • http://vehicleusains.com/runewosisazg6bhl.pdfIn PDF document text
    • https://kuvixajixi.weebly.com/uploads/1/3/1/6/131637850/bikefijinowepaxowab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ee1690e9-f08e-4eee-abf1-6f06281f3589/how_to_set_up_a_miller_plasma_cutter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35220c9-8e61-43ee-b7f4-aaced45119a9/can_you_have_a_negative_cohens_d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2c39abe-9e58-4d72-8ccb-414c86f79c0a/fundamentals_of_search_and_rescue_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e5010b3-ec16-42d1-b6f0-3b7b1d050840/fosugazobelus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b56f3517-9b05-4d05-bd32-6034decaddbf/what_is_an_organic_form_of_phosphorus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71bd706e-bc3c-4eb9-a8dc-c8a969b69a85/siloderug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0edf93-df71-4c3d-9d14-0cc914f8f693/52058697705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1c9455c-cb08-40ca-847d-e810c6e29bf3/38558836490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8147e60-b5bf-48a5-a2dd-6442be4147c9/warerudokunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ce5298d-5846-4562-8242-dc1365b44d9b/67306507368.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 4940 bytes
SHA-256: e67c601d603f4fdcb7d45a6d3da2e5df477f9a21e360f41d002b8dd87b90f8c1
font_01_sfnt_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 10528 bytes
SHA-256: 2568b2175ab35d7ce1d33c24f3afc6e160d29e1a78d7420ee0873a90d752a610
font_02_sfnt_off000127d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D5 16388 bytes
SHA-256: 2cadb2ae25cea88cb182acc54f62d1c218aef5f2772c4081b94d5d3cddde1204
font_03_sfnt_off00013d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D62 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

Open this report in the interactive analyzer, or submit your own file for analysis.