Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbfa9ea2e61ac06…

MALICIOUS

PDF

146.8 KB Created: 2021-03-18 12:17:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6e56e9a25afe1d3d16c2ee0227813e8 SHA-1: e85963482099c55beeb9a1a2b5d7d685a16369f2 SHA-256: 5fbfa9ea2e61ac06c6d2102932a84dcad1adcb962bae6a4474d04d37626b985b
166 Risk Score

Malware Insights

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

The PDF contains an embedded link to a suspicious domain, 'privateguardingserviceagainstdanger.site', which is flagged as a high-risk PDF random URL link. Additionally, the document body, though heavily obfuscated, contains text related to 'Definition du trouble obsessionnel compulsif' and references wkhtmltopdf, suggesting a lure. The presence of multiple external URIs and the ML classifier's high confidence score indicate a malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://zajinet.ru/aws?utm_term=definition+du+trouble+obsessionnel+compulsif
    • https://lutitisuputusi.weebly.com/uploads/1/3/1/4/131437948/kofopikob.pdf
    • http://adminhalil.com/71318468423mj0sj.pdf
    • http://x-bionic.shop/387191566370a23h.pdf
    • https://mosivupidener.weebly.com/uploads/1/3/1/6/131637589/sutaniwusufus_tikelugiter_fetek.pdf
    • http://venira.su/what_is_the_term_for_the_graphical_addition_of_two_vectors_give_youtwi9p.pdf
    • http://vexamukuzudeb.iblogger.org/77169688123.pdf
    • https://rowozone.weebly.com/uploads/1/3/2/7/132740293/pekapepad_werizuveki.pdf
    • http://privateguardingserviceagainstdanger.site/finding_surface_area_of_3d_shapes_worksheetqkrxt.pdf
    • http://zumanidoxup.medianewsonline.com/organic_chemistry_basic_formulas_free_download.pdf
    • https://totakolexab.weebly.com/uploads/1/3/5/3/135391630/zamiz.pdf
    • http://rowefuzoj.mygamesonline.org/daxevudavuxotunivatazi.pdf
    • http://my-favshopc.online/xenofesufixutizirh28n9.pdf
    • http://fullcreditreport.info/rizawunufobeg3vty.pdf
    • http://jirafka.space/taxabosijiuoguy.pdf
    • http://mukinumatonewo.getenjoyment.net/ranaxixasoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rulamiji.onlinewebshop.net/56863560966.pdf
    • http://tuxabatadifu.onlinewebshop.net/saluwawetigudafus.pdf
    • http://jopiwutiz.epizy.com/what_is_the_purpose_of_the_poem_harlem.pdf
    • http://popaxaxi.epizy.com/88604672238.pdf
    • http://jamanofubuvi.rf.gd/what_are_the_5_types_of_sensory_receptors_in_your_sensory_organs.pdf
    • http://lesidiwajenowil.myartsonline.com/99304091057.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_off0001fe7f.bin
cf11ddc3e45a3edd6b6e510ae4426cec213b4027ff30ed5283e3024a1330e297		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE7F 5228 bytes
font_01_sfnt_off00021034.bin
5874ade4919cbbcfeed9c26c27b0514ed834cfb3dcb7ff02f319575eafd40be9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21034 14064 bytes

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