Malicious PDF — malware analysis report

Static analysis result for SHA-256 37065578248e75c2…

MALICIOUS

PDF

71.4 KB Created: 2020-11-17 20:36:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 677c3c6c135dfec11276fc07f43ed8e5 SHA-1: d1a15f4b20fbd19842930d1b9a0552ea20dc8c4a SHA-256: 37065578248e75c2193d825cf5db9fd2594cd61eee147008f961ef7a33b0f3ba
222 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known redirectors and a link farm. The ML classifier strongly flagged this PDF as malicious. Although no scripts were explicitly extracted, the presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://cctraff.ru/123?utm_term=como+usar+app+builder
    • https://potomifor.weebly.com/uploads/1/3/4/3/134332951/ruxumipozu.pdf
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5f8a5b5e4d9ad.pdf
    • https://giboramogu.weebly.com/uploads/1/3/4/6/134627050/zinilimasoxejif-duketoko.pdf
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5f8e8c9377216.pdf
    • https://cdn-cms.f-static.net/uploads/4411483/normal_5f95e48bc8f4c.pdf
    • https://cdn-cms.f-static.net/uploads/4391909/normal_5fa3d7f185b46.pdf
    • https://miburinu.weebly.com/uploads/1/3/4/4/134464577/7982f329022f05.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/92de5a74-28d1-4af1-b30f-b95ad03548bb/unblocked_games_hobo_brawl.pdf
    • https://s3.amazonaws.com/bejeseja/subtracting_integers_word_problems_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/ace5951e-7981-421f-b3c8-9a3eec55ae32/letetifewukerata.pdf
    • https://uploads.strikinglycdn.com/files/db9d297e-cbfe-468e-ab8f-a5b56ae45c6c/quantos_ml_de_oleo_vai_na_bengala_da_titan_150.pdf
    • https://s3.amazonaws.com/medadele/if_the_moon_is_full_today_what_phase_will_it_be_in_a_week.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d08f.bin
656568678f5d7e45c5ff25b45605a1f867c86e0c2a856150fb1b0e84408d3edb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD08F 5148 bytes
font_01_sfnt_off0000e1e0.bin
f3ffe4ba3621d765656d78aaabd71fd798feab98c1821a744cf45e925a576ee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 2252 bytes
font_02_sfnt_off0000ec21.bin
fcb634949b347578984a2dbc5a3ce4db8917632ff7d7ccb695c3d482ac50864f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 11160 bytes

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