Malicious PDF — malware analysis report

Static analysis result for SHA-256 5087d90ca9103585…

MALICIOUS

PDF

73.2 KB Created: 2021-05-14 15:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6f8860ad0a4a89032a4ea0f2d4304c15 SHA-1: 619f88a3c24a434257c0c619042622c8e3c24e89 SHA-256: 5087d90ca91035855b720eaef8f0b1e19f63a7b5fb4db676405a81f17ab20e68
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by both ML classification and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be related to search engine optimization (SEO) lures, specifically targeting terms like 'Windows 10 hide cursor when idle'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://bologen.ru/wb?keyword=windows%2010%20hide%20cursor%20when%20idle PDF link annotation
    • https://resonorur.weebly.com/uploads/1/3/4/8/134874279/1497d69d61935c.pdfIn PDF document text
    • https://xomiwisaxi.weebly.com/uploads/1/3/3/9/133999446/bulogowimajas-wefifopexube-nigasudibese.pdfIn PDF document text
    • https://cdn.sqhk.co/woxipepevati/egjVtge/wejoy_portable_android_projector.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/cFeSXhh/fake_video_call_girlfriend_facetime_prank_apk_download.pdfIn PDF document text
    • https://xupusunozad.weebly.com/uploads/1/3/1/0/131070799/9303601.pdfIn PDF document text
    • https://cdn.sqhk.co/wamobuzo/hegdjid/6596851617.pdfIn PDF document text
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/jasanatunik.pdfIn PDF document text
    • https://wonaxegem.weebly.com/uploads/1/3/6/0/136049801/petulogeboduvanipepo.pdfIn PDF document text
    • https://cdn.sqhk.co/jogowijalaro/icDLAgf/78863075213.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/q2Egejg/morehead_city_powerboat_races.pdfIn PDF document text
    • https://cdn.sqhk.co/fokatekox/EtVDria/27917557963.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/2977547.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/fanebi-tiwukowikodelaj-saxugezelomu.pdfIn PDF document text
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/xuwifixejudanu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/midipes/zugorebogasujezodaf.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/how_good_is_your_english_vocabulary_test.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/81370076100.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_355765c8a4234794ac260601bec05d3e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/92984333418.pdfIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_1aa6b6d227884ef0897b45dd1eb00be6.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_off0000e287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 5116 bytes
SHA-256: f6079c2f78a7ecbfa9a37d821e8033219331aaf3a6da50ffde17747aa2cb56ac
font_01_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 10392 bytes
SHA-256: 85a7bd5755d6923fdbaa29671741ba0cd07f033e885bd685b3399ce6d7b7025d