Malicious PDF — malware analysis report

Static analysis result for SHA-256 23eb1f274f2a03b5…

MALICIOUS

PDF

78.6 KB Created: 2021-03-19 12:30:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7788e68ce663f6d3da457f6b0e6f98a0 SHA-1: f9090e30e25d38ece4c55a16c2ba8253b06d6f33 SHA-256: 23eb1f274f2a03b59d43326bd88d09cdfd83b6860ed14c89a0775ca69adc1c5f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure and potentially malicious content, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs are likely used to distribute further malicious payloads or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/123?utm_term=school+newspaper+template+indesign
    • https://cdn-cms.f-static.net/uploads/4471250/normal_602834bc59c77.pdf
    • https://cdn.sqhk.co/jovowosifo/ciahihd/40785601544.pdf
    • http://baliferifopiz.mypressonline.com/87592100930.pdf
    • http://vijofudevadotar.mywebcommunity.org/angle_of_depression_and_elevation_problems_with_solutions.pdf
    • https://pevunefimexog.weebly.com/uploads/1/3/1/0/131070247/gulenowox-nokepu-tasipi-papagufetozub.pdf
    • https://cdn.sqhk.co/kokijunuxagi/hgcwhb6/36668824153.pdf
    • https://kijatuvoriwoze.weebly.com/uploads/1/3/4/3/134352029/3639341.pdf
    • https://cdn.sqhk.co/dijabidasu/xhidjc5/fire_on_fire_sheet_music_sam_smith.pdf
    • http://peguxukeziku.sportsontheweb.net/70632859366.pdf
    • https://static.s123-cdn-static.com/uploads/4484363/normal_5ff0da8876bd0.pdf
    • https://cdn.sqhk.co/giganopof/pETeEjf/robotics_notes_elite_review.pdf
    • https://cdn-cms.f-static.net/uploads/4454424/normal_5fdabe0bc615b.pdf
    • https://netemadore.weebly.com/uploads/1/3/5/3/135306203/9985396.pdf
    • https://cdn-cms.f-static.net/uploads/4373992/normal_60381a03d6a22.pdf
    • https://dupomogorudo.weebly.com/uploads/1/3/4/5/134595760/8354482.pdf
    • https://cdn-cms.f-static.net/uploads/4376374/normal_6021d42b24787.pdf
    • https://cdn.sqhk.co/moxoxitij/cgjjbIB/parenafawesu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sevoga/mp_hinv.log_location_sccm_2012.pdf
    • https://s3.amazonaws.com/zexozavo/mikilirulowuwimexafu.pdf
    • https://s3.amazonaws.com/sitok/where_to_buy_baby_g_watch_strap.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/adding_decimals_worksheet.pdf
    • http://jokodakive.onlinewebshop.net/puxegosit.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_off0000f2b6.bin
bfa84bfe7249fbcc25d3b09d396508663e3a24b19a6a05f6011aa969c454abf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 5680 bytes
font_01_sfnt_off000105f7.bin
95ea37f8f57fca3cc6b7aab0af88d5e622bc343f6fbed4143abcecff8120f1a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 11036 bytes

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