Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ca539dbb2d2b06…

MALICIOUS

PDF

83.8 KB Created: 2021-03-16 07:23:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b90a5bc22b152f81fcbe200d4060d149 SHA-1: bf975fbff2e2d6340d882675a32267a0c0eeb52b SHA-256: d1ca539dbb2d2b060967f1bd1cbbe608bd24b4fa1f6e1b3288f4d20aaf3257a2
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the heuristic findings point towards an attempt to trick users into downloading further payloads by masquerading as legitimate educational resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/award?keyword=class+12+cbse+chemistry+textbook+pdf PDF link annotation
    • http://selectgetc.top/navefomaloxolstle.pdfIn PDF document text
    • https://cdn.sqhk.co/rawavuzom/8MggY8s/76739033704.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/8KgWic4/papa_louie_cooking_games_cool_math.pdfIn PDF document text
    • https://cdn.sqhk.co/janurisu/ijjajjW/46374712209.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/9DYhhjb/space_shooter_galaxy_attack_galaxy_shooter.pdfIn PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/sawoduweduzenoxuforifapej.pdfIn PDF document text
    • https://cdn.sqhk.co/samanugutu/hdgijem/55929048859.pdfIn PDF document text
    • http://jirusulixozome.scienceontheweb.net/98178150819.pdfIn PDF document text
    • http://dexaputanit.mygamesonline.org/susasigidozetobuzum.pdfIn PDF document text
    • http://requiremcgood.com/5834721020z8whg.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/cell_culture_techniques.pdfIn PDF document text
    • http://sobakin.space/the_hand_sculpted_house_freeb9sl9.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/ccrhiKx/61977740862.pdfIn PDF document text
    • http://marketitaly.pro/what_is_a_safe_temperature_for_food_in_the_refrigeratorp5pxm.pdfIn PDF document text
    • http://simkosa.website/81655649092r26t1.pdfIn PDF document text
    • http://sogejovep.mypressonline.com/mowurinexabi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_d81e40e3a3b14a28976d4808e85c57df.pdf?index=trueIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_a958425816e841968b4443aa843341f7.pdf?index=trueIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_8e2554f60ce44867a2029427f29ed8b4.pdf?index=trueIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_c62422ceecfe4c018ad1f4c639d13b5b.pdf?index=trueIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_ff0d8e823a4f4ecfa005f6ff591b606c.pdf?index=trueIn 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_off0000e3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 5856 bytes
SHA-256: 8ac9e61d082a984141ce6cdee982e355ec365db6b4f22a6f4c23897c0a318465
font_01_sfnt_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 11648 bytes
SHA-256: f32dd4acf3f45dada2d5545f02e731dd7365da1b5375e97df8ee74032408d373
font_02_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 16096 bytes
SHA-256: 7abc053b067790dce98f5e0953789ba27cd492a81e299876af0b74551ca50db4
font_03_sfnt_off00013479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13479 3260 bytes
SHA-256: aa0141ef1983ca6a1e75555c5f201f5e267198d67577c6d264f88900ae5ec0d3

Open this report in the interactive analyzer, or submit your own file for analysis.