Malicious PDF — malware analysis report

Static analysis result for SHA-256 304e80007f77b780…

MALICIOUS

PDF

85.9 KB Created: 2021-05-18 15:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1849cd9f00c0b5f1d4f1c70720f0dc22 SHA-1: 67eca4b719d4d99767fad52441fa725eb43712c9 SHA-256: 304e80007f77b7808be24cdf0a10545882650de111d9204aefd83b4203093484
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a link farm containing numerous external PDF links. The ML classifier also assigned a high probability of maliciousness. The primary attack pattern appears to be the creation of a large number of outbound links, likely for SEO manipulation or to distribute further malicious content, as indicated by the ClamAV detection of 'Pdf.Phishing.Trojan'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9591

Heuristics 4

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://crophysi.ru/strik?utm_term=full+focus+planner+pocket+review
    • https://motisodufar.weebly.com/uploads/1/3/5/4/135400919/jufekatataf.pdf
    • https://vataviborabedim.weebly.com/uploads/1/3/4/0/134012391/giwejupoka.pdf
    • https://static.s123-cdn-static.com/uploads/4448094/normal_6000d5622a7de.pdf
    • https://zibekasosux.weebly.com/uploads/1/3/4/0/134040395/e13faacea.pdf
    • https://static.s123-cdn-static.com/uploads/4373519/normal_5ff1bf7409431.pdf
    • https://japipimimobuxi.weebly.com/uploads/1/3/1/0/131071183/c672a74be58.pdf
    • https://cdn-cms.f-static.net/uploads/4456728/normal_60212bd58157c.pdf
    • https://vazoxavaver.weebly.com/uploads/1/3/4/8/134863882/8559095.pdf
    • https://zajewovebuvi.weebly.com/uploads/1/3/0/7/130739158/8997667.pdf
    • https://zefuduxob.weebly.com/uploads/1/3/4/8/134895043/bf12423a0fca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wuwabobujasivor/kapiwupapare.pdf
    • https://uploads.strikinglycdn.com/files/8a47f9bb-8391-4d26-8960-6b449df4debf/harry_potter_6_movie_wiki.pdf
    • https://uploads.strikinglycdn.com/files/2c0b81a3-2fe5-488f-ad97-d11bdf6af245/73065879860.pdf
    • https://uploads.strikinglycdn.com/files/edb9e62a-4692-4f7f-8b84-6e25eac4b0ca/46757037317.pdf
    • https://s3.amazonaws.com/gonima/kenmore_french_door_bottom_freezer_refrigerator_not_working.pdf
    • https://uploads.strikinglycdn.com/files/ab1d5b17-20dd-40cc-9edb-180df5d58a6a/how_to_fix_a_motorola_phone_that_wont_charge.pdf
    • https://s3.amazonaws.com/baxegezivumi/which_hosting_is_best_for_wordpress.pdf
    • https://uploads.strikinglycdn.com/files/ad9aef9c-81ed-4977-8817-4d092896cebe/doxidunugubofiv.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012493.bin
f838229af33426b3d40ca6d87fdc98d911813114cb964b9eacdc1f3b53619fa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12493 5180 bytes
font_01_sfnt_off00013661.bin
029128cf4e2a7994252b82ae5c2c6efe86ebab27a5b7f510711ca50f7cf196eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13661 10888 bytes