Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a72b2a61a8131ba…

MALICIOUS

PDF

81.6 KB Created: 2021-03-24 11:16:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac0fb285aba33979df452033f8289b43 SHA-1: 94b689a6933c5d82be25b0e3489c05c3759f8268 SHA-256: 6a72b2a61a8131bae3c36d0233fc7688b6adb87ec73678321b3bb226ba185b43
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 of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xajibur.ru/wix?keyword=i+am+number+four+book+parents+guide
    • https://lodoxaravejow.weebly.com/uploads/1/3/4/7/134719504/fowebedifaxabosixez.pdf
    • http://tomolijoponix.mypressonline.com/53537732177.pdf
    • https://wiwazojuxosupud.weebly.com/uploads/1/3/1/3/131379189/dubujopusesile.pdf
    • http://kirudikegopoded.sportsontheweb.net/vewamapojivefiz.pdf
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/931e69d679d401.pdf
    • http://rikafitamedad.medianewsonline.com/carnival_of_venice_sax.pdf
    • https://lurusavi.weebly.com/uploads/1/3/2/7/132710630/taravik_litozaj.pdf
    • http://takipibimaxubov.sportsontheweb.net/55774700554.pdf
    • https://tetemubegogik.weebly.com/uploads/1/3/4/4/134443084/wixasufidep.pdf
    • https://kumenesasewoton.weebly.com/uploads/1/3/4/7/134773405/3868930.pdf
    • http://dimozakebaba.scienceontheweb.net/wetufufanojewu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_a92c55b52b8d4ccb8ac07a531fd7d590.pdf?index=true
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_8ba9f716d0a24990a5039a533b06f373.pdf?index=true
    • https://uploads.strikinglycdn.com/files/29a735dc-3364-4f78-a102-7c0a2dd2f8bc/play_blackjack_online_for_real_money_no_deposit.pdf
    • https://uploads.strikinglycdn.com/files/56a867bc-086c-43a4-a238-a4a3776249f4/tragedy_of_the_commons_hardin_citation.pdf
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_9e7756bd8f6b4260943aaf51ab35777c.pdf?index=true
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_9e32fbca24ea438faaa7c8f1addc5528.pdf?index=true
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_4e35027255bb4aa6ac6c8721a78a8b2c.pdf?index=true
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_2cd4ce90926a4f1fbe293e8a6a1a95b4.pdf?index=true
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_965ec35b979b441eb6ee5df31591c72e.pdf?index=true
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_271cec675e4d4ab1969815dc45e3530d.pdf?index=true
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_bebdd93a1fae4f9f986845174a69b7b6.pdf?index=true
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_546ea7fd644a48f387cb661043466c6d.pdf?index=true
    • 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_off0001011a.bin
71dc996ec2827146307f10cd249d42edac3016e7dbea4d203ac34ad26f6c0656		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 5472 bytes
font_01_sfnt_off0001139b.bin
cfeb5c80e58319ba622efdb5fe9410759b9b417e88b6a9aa008146a394af8872		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1139B 11060 bytes

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