Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8db56fb453769ae…

MALICIOUS

PDF

80.6 KB Created: 2021-06-02 12:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50d9c4ebaefec24cd8d63aebfd0dba29 SHA-1: 7427a98c2fd10b5b6e3af19673208e98398ef3dd SHA-256: a8db56fb453769ae8620e8a4456da50a8b96de711afd7eec020a3801fcbdc820
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on free services like Weebly and PBworks, suggesting a link farm or phishing operation. The document body mentions 'Bookworm adventure 2 free for pc', indicating a lure to download potentially malicious software. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=bookworm+adventure+2+free++for+pc
    • https://wixugowodekawa.weebly.com/uploads/1/3/1/4/131438135/demifibebi_kaloxoba_kuvabunelopazob.pdf
    • https://dugilosokufaku.weebly.com/uploads/1/3/4/6/134610324/3572d076ffb66.pdf
    • https://jibametugo.weebly.com/uploads/1/3/4/4/134486067/kipokupexusibojojaku.pdf
    • https://sonujeti.weebly.com/uploads/1/3/0/9/130969686/zanigada_munotedetuwu_bazodonuxurer_xarirabigu.pdf
    • https://bulipabuwalo.weebly.com/uploads/1/3/4/1/134131868/796e1.pdf
    • https://static.s123-cdn-static.com/uploads/4414691/normal_5fc62a80bac94.pdf
    • https://static.s123-cdn-static.com/uploads/4454543/normal_5ff9053e76de4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jajafad.pbworks.com/f/tapovobedixaniboluzuxuv.pdf
    • https://uploads.strikinglycdn.com/files/93ff4ef5-493c-4fe4-8a84-0913e0f78b5c/ravejidisuxik.pdf
    • https://uploads.strikinglycdn.com/files/a6840448-f021-4859-ae54-96219231e74d/78193194417.pdf
    • http://wekibivu.pbworks.com/w/file/fetch/144469842/78899940224.pdf
    • https://uploads.strikinglycdn.com/files/e169e2a8-8d00-4196-8d63-811a51c3b4ab/what_constellations_can_i_see_tonight.pdf
    • https://uploads.strikinglycdn.com/files/1ebe8194-16c2-4960-951c-722cb9a0d74a/7975264125.pdf
    • https://uploads.strikinglycdn.com/files/2d8070d4-9853-4fc2-9b35-8d394515d1a5/29384682495.pdf
    • https://uploads.strikinglycdn.com/files/4cecef07-60a8-4261-aa89-7fbb011d3f36/27410438274.pdf
    • http://tisowowuduwe.pbworks.com/f/28667186608.pdf
    • http://zezimin.pbworks.com/w/file/fetch/144412821/stative_and_dynamic_verbs_exercises_multiple_choice.pdf
    • http://mujusevo.pbworks.com/f/how_to_make_a_fake_plane_ticket_free.pdf
    • https://uploads.strikinglycdn.com/files/e3fcc83b-2803-42c5-9a1e-baebf204589b/revofiviwelaguguva.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000face.bin
4e83a7f43a999e6009c091016debd868582fefa5d4a241991d1928f44a7574c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 5488 bytes
font_01_sfnt_off00010d8b.bin
006492e618ad3635dbd37323cdd25abf27ac8b9c0224df3023c5fa9ecb17dfd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8B 12012 bytes

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