Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9633d966decb39…

MALICIOUS

PDF

89.1 KB Created: 2021-06-09 23:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5bacc14b0e99c15c31a65c4d81058e8e SHA-1: 33b594733680bc6f9f13d293963cb9b262264479 SHA-256: fd9633d966decb394f151b72a6f0772ec6b3e5a3159f7d834aa6487872a1674b
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of a 'download button' heuristic and a high ML classifier score, along with ClamAV detection as 'Pdf.Phishing.Trojan', indicates malicious intent. The embedded URLs likely serve as lures or redirect to malicious payloads, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crewmak.ru/pbw?utm_term=pokemon+omega+download+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485935/normal_6023fab0114b8.pdfIn PDF document text
    • https://wanesoxe.weebly.com/uploads/1/3/4/3/134369563/vebor-suzitamipovuwud.pdfIn PDF document text
    • https://nokifafib.weebly.com/uploads/1/3/4/5/134597692/329194.pdfIn PDF document text
    • https://rezosegog.weebly.com/uploads/1/3/2/8/132814067/32cc1e3b.pdfIn PDF document text
    • https://mumamelif.weebly.com/uploads/1/3/4/4/134464597/53566.pdfIn PDF document text
    • https://komavumi.weebly.com/uploads/1/3/0/7/130738531/danunopav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381085/normal_5ff8a91c54a42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485828/normal_5ff007cad417f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5fd6738003b5f.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/5d5b1130-a4f7-437e-85aa-3c60e157ab40/prodigiorum_ac_ostentorum_chronicon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62756c05-f98b-45eb-9c2b-962baa03b9aa/vivofit_jr_2_wont_sync_after_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d757982-f868-4fc5-8823-59ccb73ec0e5/what_devices_can_run_60fps_on_fortnite_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4435a05c-2fc2-4d45-b658-3797c68d235c/rheem_22v40f1_pilot_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aee4166a-104b-40cf-9ca1-6a4921b7244b/luwunuvilumexekuved.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/749b876a-828f-4f3e-a214-0de0bc828580/donebifavaleriru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e4e9e5-887f-4152-a944-3dd85e015c3c/what_is_the_difference_between_honda_eu2200i_and_eb2200i.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0d21597-493f-4043-93c8-438d5a74a78c/rowoxudopenojenube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ced5b2d-cd6a-4e85-84c6-575b03d7fd83/difference_between_concentric_and_eccentric.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_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 5164 bytes
SHA-256: 31199b36ae787f3297e790fd4dc187ab695c5e29fe4c13140f384021706c487e
font_01_sfnt_off00010f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 12520 bytes
SHA-256: 9506a4c0ddb7eea421bbedbc5254beaf0cafddca7b33e8a9f9a0f25fd2a54f05
font_03_sfnt_off00014084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14084 16416 bytes
SHA-256: c39953f0148d5f856d9856cf740d086a93c48ae39e3202c569b932315140d4a8

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