Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1df71f0c9617d8a…

MALICIOUS

PDF

86.0 KB Created: 2021-03-13 16:08:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a0eacb09db3b679b0c3d2a12c75f8a20 SHA-1: a7e0a40909c72251c8d94fea1fe430f77fba9519 SHA-256: c1df71f0c9617d8a7b7b015dc4bb18dd138dc6aa43cc89f89ca8fdf5a0b17bf9
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one specifically pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a 'colour personality quiz'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://jumiwimov.ru/award?keyword=colour+personality+quiz+pdf PDF link annotation
    • http://idem-peshkom.ru/12460717939zlbfh.pdfIn PDF document text
    • http://fashion-deals.xyz/9683112805581ilb.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/kafka_on_the_shore_review_indonesia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474191/normal_5fea12635a2a9.pdfIn PDF document text
    • http://keto-s1.com/behringer_xenyx_x2442usb_multitrack_recordingz4h1a.pdfIn PDF document text
    • http://wojesukuzak.mygamesonline.org/writing_broadcast_news_mervin_block.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413693/normal_5fde53018a532.pdfIn PDF document text
    • http://sisogelodaze.medianewsonline.com/kurevuvaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416495/normal_6045f511239f4.pdfIn PDF document text
    • http://gbo.guru/jajexejujunojigidetugohfs8q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447641/normal_600cbac41a5f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_603ec57657801.pdfIn PDF document text
    • http://usmileofficial.site/naturalizer_boots_amazon2t6p4.pdfIn PDF document text
    • http://leririv.sportsontheweb.net/renijamatowej.pdfIn PDF document text
    • http://fizovovapoz.iblogger.org/23391279761.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kegebezevenaku.epizy.com/litamonos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/227fa9da-ba17-4ad9-a94c-e3d3eb066611/46807557227.pdfIn PDF document text
    • https://c0e8410b-c394-4b36-8083-179878a46647.filesusr.com/ugd/d4b1dc_44a7a1b544314ee39929b77ce0b8ade5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ecdecff-df44-4ded-9965-cbeca150d566/can_i_watch_50_shades_darker_on_netflix.pdfIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_e6404536a33a40d8b394e9ef48b8911a.pdf?index=trueIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_a92be856ffa443f5afddc0b63f6e1426.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa4477f3-32a7-4773-ba38-ad51b1d08130/how_to_show_patriotism_essay.pdfIn PDF document text
    • http://puzukeni.rf.gd/nilaxarawuwoj.pdfIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_d2541ed033ca4223881b5b57964d14bf.pdf?index=trueIn PDF document text
    • http://jonikabaxo.rf.gd/88903325576.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_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 5216 bytes
SHA-256: 7b959ca2b2dca99d8902e9a9addc6ce32f130f5810d2b8c264abf2b2cd991fe4
font_01_sfnt_off00011660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11660 11072 bytes
SHA-256: 1d7fba18e7d44282ed5ab9f1305db400d6c9371324d60876b12c5dc77bb6ee27
font_02_sfnt_off00013bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176