Malicious PDF — malware analysis report

Static analysis result for SHA-256 931271709be51d0c…

MALICIOUS

PDF

75.7 KB Created: 2021-04-11 14:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8049840a164fb88f1f0212cf19317df5 SHA-1: c153f1ed6057e97bcb04c45f8c8b5f85bc65e52e SHA-256: 931271709be51d0c868ba1203ed824945cb23ceeb9b8ad3eb37727adfc73f0d9
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a link farm and a redirector URL, suggesting it's part of a phishing or malware distribution scheme. The embedded URLs and the heuristic findings point towards an attempt to trick users into downloading further malicious content, likely through a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gimoguvi.ru/strik?utm_term=dungeons+%2526+dragons+core+rulebooks+gift+set+canada PDF link annotation
    • http://kixinikuzilot.22web.org/64997742015.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/zumezeviwakiz/39158673525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab403e9-a100-418a-985b-7d5daec3a59c/1623519686.pdfIn PDF document text
    • http://validexa.epizy.com/asmaul_husnah_dan_artinya.pdfIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_b2471789544748458e4deb2a2460d2fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/mixunaxoxefinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3aaa10b-803f-43bb-8c29-6add82238768/how_do_you_reset_the_drum_counter_on_a_brother_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/upsc_prelims_2016_answer_key_set_a.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/83269363019.pdfIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_a8ffaa96fc5446fea6bb4fbc30a0d6c3.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_25e1d2b17f7e4039b35796b42c02b8a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/popilo/10160806053.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/how_much_are_they_paying_nigerian_navy_recruit.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/bagaliledisuvo.pdfIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_104e649620a14f5eb8488921d0f820c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/41262714666.pdfIn PDF document text
    • http://lekipuvuji.epizy.com/film_boboiboy_the_movie_2_layarkaca21.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/54617880347.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/68599187674.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_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 4508 bytes
SHA-256: 6b401b323d56c1d6ca9dcc74cd4f1f7da659ff445b23d6084755cdd4b62694bf
font_01_sfnt_off0000fcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBD 11036 bytes
SHA-256: bb8827dfd87bc913da4d2ae7a4f36c84d786d0cc507dfafc431e5f9bc1b0c94d