Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90306380d2479a9…

MALICIOUS

PDF

79.9 KB Created: 2021-05-22 03:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c2ebfee9c9908ba49d5343aa05a7cbc8 SHA-1: 9da08cd59c18cc7d64dcdc04bd39cd2ff5e87498 SHA-256: a90306380d2479a9744dfb48617a0d994f631e73223b631c14ff415e34ce605b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://midufefew.ru/strik?utm_term=crash+bandicoot+the+wrath+of+cortex+pc+emulator PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495390/normal_5ff1c90d1a67b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393898/normal_6019f0c935db2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417537/normal_60396eeb4a6a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472753/normal_60672446ac021.pdfIn PDF document text
    • https://denapifikuzo.weebly.com/uploads/1/3/4/6/134634031/timopedazotag-kigitoz-rubuxo.pdfIn PDF document text
    • https://nezivubu.weebly.com/uploads/1/3/1/3/131384481/1925cc4de47b.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/ee56c4a3-163d-4202-81a7-5f8733d6710d/24880771756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09501972-d59c-4c36-8efc-db8bec03d604/depopedefazexisukafukeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaad4ec3-1645-4e67-a9a8-da098994823c/sportspower_willow_creek_wooden_swing_set_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f65d74-9e7f-4c7e-aa66-2a6be055771a/brandon_burlsworth_locker_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a287b5ed-4a23-409c-977b-2eb0a9986fbe/santa_clara_pueblo_v._martinez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ef6451-d565-4057-ad59-40ab1a7d7f04/vototodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9a7ccb1-9112-41e2-970f-a268ab2cb8f0/vowedofoxipajuvenugez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68766b48-90f3-4daf-9063-fb39a5e55887/the_crown_cast_season_2_jackie_kennedy.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/gozojib.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/lathe_of_heaven_summary_chapters.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/samiran_das_all_baul_song.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/stanley_fatmax_powerit_1000a_how_to_charge_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bef98d1-1e52-4d74-a217-25823d3531c4/bufezuzenulewimamugaralul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7127f73c-3341-4415-bc3f-206239d83689/die_unendliche_geschichte_film_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/dark_souls_remastered_ps5_60fps.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_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 8348 bytes
SHA-256: 8cf4151a5494b37e5539b4c2226a872c67dacfcbf0a24352001fdefbf25fa1d5
font_01_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 5600 bytes
SHA-256: 83a99ca5d116314e3e8e34aac3e60e142ec607d9c5c41d68977e39458a8c3bd6
font_02_sfnt_off00010a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A22 12104 bytes
SHA-256: e00159836e4ee3b2854c6cea96e7e63d4d330ec64fefd2359da86aabfe2eabc5

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