Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2bc40e3ccd62a9…

MALICIOUS

PDF

85.3 KB Created: 2021-04-17 13:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2197d844d4c276a0eec2c3cb4d1f9fbd SHA-1: d5c6e2f3300030f6f957cd069ee86ce19949c697 SHA-256: dc2bc40e3ccd62a90c010bcd9cca931c48eb90597220446069db496f62919fa1
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The primary URL, 'https://xajibur.ru/strik?utm_term=washington+post+subscription+rates+2019', suggests a lure related to subscription rates, while the embedded links likely redirect to malicious content or further phishing attempts. The ML classifier and ClamAV detection strongly support its malicious nature.

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
  • 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://xajibur.ru/strik?utm_term=washington+post+subscription+rates+2019 PDF link annotation
    • http://dawexefif.getenjoyment.net/how_to_service_esc_on_2010_malibu.pdfIn PDF document text
    • https://xidekazepo.weebly.com/uploads/1/3/0/9/130969591/409e8e.pdfIn PDF document text
    • http://instapodarok365.site/diary_of_a_wimpy_kid_movie_the_long_haul_actorssmfb9.pdfIn PDF document text
    • http://uscarinsurance.info/how_to_use_bosch_ascenta_dishwasherw6gi5.pdfIn PDF document text
    • http://sujolisake.medianewsonline.com/hemoglobin_estimation_methods.pdfIn PDF document text
    • https://bagubabijotete.weebly.com/uploads/1/3/4/3/134319258/481919.pdfIn PDF document text
    • http://popularchoice.space/irritrol_kwikdial_fusedzlbw.pdfIn PDF document text
    • http://tuimag.ru/6442489298430k84.pdfIn PDF document text
    • http://solapp.xyz/divine_mercy_shrine_poland_gift_shopgtngg.pdfIn PDF document text
    • http://govnososal.xyz/talawelejulenuxeriridbx0xz.pdfIn PDF document text
    • http://jawazapefaxuzit.mywebcommunity.org/it_s_all_coming_back_to_me_piano.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taroveruwidiba.onlinewebshop.net/vovaxowajiporig.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_79d3fb01de6f40efa1f0028cda249f71.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/paramagnetic_or_diamagnetic_examples.pdfIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_d6599102e2204f2a857a931574915cd8.pdf?index=trueIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_1c5b198510f646a4afef913a36abd93f.pdf?index=trueIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_d7ba700803984f23ad5a85a7330459de.pdf?index=trueIn PDF document text
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_291a13d67961407fa5ab1bb884d4dc2e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/biotage_turbovap_lv_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/lulumapaf.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/15554318198.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFC 5800 bytes
SHA-256: 5c74e9bf1dbea7a1a516dadd2e0bdc47b10970edd3bcaf2de614ad8697406be2
font_01_sfnt_off000121c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C3 11204 bytes
SHA-256: 9745e78acf90ff3e6926f6d88ebd0365ee42e19db44fa28c9ffe2f204c4599fb