Malicious PDF — malware analysis report

Static analysis result for SHA-256 5782bb2cb962abe8…

MALICIOUS

PDF

84.6 KB Created: 2021-03-28 12:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c13aaac7fb2c0e5e623f50ea7073eac6 SHA-1: 21e1262e978ea387dadee381e360c44938bc8399 SHA-256: 5782bb2cb962abe84fc2869b166570e371b5dbf0c6adada482f0aab05c264b00
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be junk data, offering no direct clues to the user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://dafemum.ru/award?keyword=automatic+transfer+switch+for+generator.+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_6046faced5ac9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422135/normal_60313656ee734.pdfIn PDF document text
    • https://cdn.sqhk.co/giwerezekobe/ihcgevH/73454826518.pdfIn PDF document text
    • https://cdn.sqhk.co/zopezepazedo/iieCkU4/pipumiwedi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_60511092aa8d5.pdfIn PDF document text
    • http://mjawebdesign.net/samsung_galaxy_s9_plus_lifeproof_fre_casexzaxc.pdfIn PDF document text
    • http://myluckybet.xyz/86954489606eg8gw.pdfIn PDF document text
    • https://cdn.sqhk.co/fepogosu/jaWoxw0/mx_player_pro_1._15._9_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/jqTt1he/nubawuzuzuwebop.pdfIn PDF document text
    • http://rewita.fun/water_world_movie_tamil_hdxnns8.pdfIn PDF document text
    • http://pribor-poverka.site/eq_p99_bard_leveling_guidea54a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5fd89d4c4401e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445868/normal_60283d81ce13e.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/WQhajbe/94909162754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_6026ded353e9c.pdfIn PDF document text
    • http://betflixguvenilirmi.com/why_wont_my_swann_app_workflp8o.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/a8010028-e548-4ddc-a926-7a8e2e47f224/7649966533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b906faa9-af8c-46c6-a36f-8d7fbdb0f79e/disobavatamemujabiloja.pdfIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_9b8917da36b5484a8d19834bd391878e.pdf?index=trueIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_be677bc14ce1434fa7b70596a15797a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a437bcc2-2ba4-452c-9669-4699f6f1e513/troy_bilt_generator_5550.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 5532 bytes
SHA-256: 736a9f62462208d47d9498cfb371fbb8acd8eb38160e09a4f04ac9b7ca4b54da
font_01_sfnt_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 11880 bytes
SHA-256: 3af5fabe444ec688719feeca3f4bbb4e8c85503004c7d6ab1fb834979d22f8dc
font_02_sfnt_off00013752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13752 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176