Malicious PDF — malware analysis report

Static analysis result for SHA-256 2225e141e7b34210…

MALICIOUS

PDF

77.6 KB Created: 2021-03-23 13:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 28b1764d979cc6b662a62b4c96b13a7c SHA-1: 51c2f6e477ae7e2c174d40f495d0ebd4338ea05d SHA-256: 2225e141e7b34210a72602472320cb25f2aa6f10c18978a014985057eea20d0d
186 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to exploit users via redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://gimoguvi.ru/award?keyword=chaupai+sahib+pdf+with+meaning PDF link annotation
    • http://zuvalasit.mypressonline.com/90375550032.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/what_my_default_router_ip_address.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/panasonic_cordless_phones.pdfIn PDF document text
    • http://didazema.mypressonline.com/lsat_logic_games_practice.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/7002146.pdfIn PDF document text
    • http://zikevamakag.mygamesonline.org/98200321073.pdfIn PDF document text
    • http://punejew.mygamesonline.org/gikukubipawuvujusog.pdfIn PDF document text
    • https://kipunazumalimak.weebly.com/uploads/1/3/4/7/134755782/0acc82d603542.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_9987254441454c9cbe222aaad6007f9b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ddaa70f-013a-4b72-9439-54580db3a0fc/oxford_picture_dictionary_2018.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_0d7f9fa2b7b641068fdc821f648b86ec.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_d7b782fd971840238b54f444a4c73f7a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cee3f12-58c8-4006-a8e2-90d76a9d7d8e/pikakotov.pdfIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_531187093af54a54afa5a8787cefe069.pdf?index=trueIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_3b1b584a674b4da5b004291262d9b8e0.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_1f0ad5b791954a5787fce76f4dc55947.pdf?index=trueIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_1dff68deada446d79db7e63da6891b91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/02f838c8-1123-4a35-9e93-0662618ab2eb/how_to_start_trading_stocks_in_philippines.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/what_is_the_best_waterpik_for_your_teeth.pdfIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_4ee366d6345c472caa43526263e988d6.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 5464 bytes
SHA-256: e6b2cd13d5e8c63eb1e042894780696fbfa01801cf51e067eb058baee8b298b5
font_01_sfnt_off0001035b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 11048 bytes
SHA-256: a5c5e1477fadefa897159199f9fc3f453a545237cfb9c7c26e3506ba9512b045