Malicious PDF — malware analysis report

Static analysis result for SHA-256 d441a3ec7526141d…

MALICIOUS

PDF

81.3 KB Created: 2021-03-19 13:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fc2a0b2db52dd1614917d7a88162c08e SHA-1: ce363fe4846535d5254085c2f8a1ec9dd4e2f945 SHA-256: d441a3ec7526141d308b22b425f42e78f43f02bfa4e58d2f884820dd17032902
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious redirection and SEO link farming, specifically pointing to the URL https://yafferge.ru/123?utm_term=ateneo+application+form+college+2019. The ML classifier and ClamAV detection strongly support its malicious nature. The document body, though heavily obfuscated, appears to be a lure related to an 'Ateneo application form', aligning with phishing or malware distribution tactics.

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
  • 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 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.
  • 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://yafferge.ru/123?utm_term=ateneo+application+form+college+2019 In PDF document text
    • http://razagewodun.iblogger.org/38180022841.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xeziribosivamis.epizy.com/62046100534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb75148-e282-4928-900c-164bd02ad4ff/how_to_delete_google_maps_recent_search_history.pdfIn PDF document text
    • http://sonopuzogex.rf.gd/volvo_bm_6300.pdfIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_3a6d1e7c46e742f0828ccc5b0d2e4696.pdf?index=trueIn PDF document text
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_fe3296fd733440e09a796ac023bf6476.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2284f245-9336-48a3-89e9-19c688135076/lekovoziwesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d70897-90b1-4f2c-847e-235f015cd5a2/rheem_power_vent_gas_water_heater_troubleshooting.pdfIn PDF document text
    • https://d1ced4a1-fa29-4c66-b583-77209f32159a.filesusr.com/ugd/c88d8b_60386e0be9a64b32982251c3945e3cbc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazutun/wordscapes_answers_daily_puzzle_october_15_2019.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_f34c0237c7d740189cbc55c55995c136.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/step_ahead_biology_book_3.pdfIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_b78275829eed4f5a8dcd412127441573.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/homelite_leaf_blower_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/45288216661.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/95543182683.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/67553697219.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_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 5628 bytes
SHA-256: c8a7c3b04dcc00e50abc1ab92fb1f2b5e9549bc4d12789283ae4a642b62fa3f3
font_01_sfnt_off0001123a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 11212 bytes
SHA-256: 1c4430eb30e7949873aabb154f9b4eed691f34cb835c5cd6fbb243ab4b6fe26c

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