Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc627214905a864…

MALICIOUS

PDF

83.2 KB Created: 2021-06-03 05:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1dc8bd4552be470683e9eca9b5822f2d SHA-1: 3c768aab67d3a295597a5e895ffadb84f4b85af8 SHA-256: 5fc627214905a86445f65b6711694ba4686f23f38083a79525543cfefb3c18ca
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm designed to direct users to various websites. The presence of 'utm_term=adobe+acrobat+for+android+phone' suggests a lure related to software, potentially for phishing or malware distribution. ClamAV and ML classifiers also flagged this PDF as malicious, reinforcing the suspicious nature of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/123?utm_term=adobe+acrobat+for+android+phone PDF link annotation
    • https://kotasixunepa.weebly.com/uploads/1/3/0/7/130776076/8204139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457305/normal_60356e4f5e890.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461523/normal_6004af10afd2c.pdfIn PDF document text
    • https://wipabobape.weebly.com/uploads/1/3/5/9/135985954/14779492e.pdfIn PDF document text
    • https://fegopamaxu.weebly.com/uploads/1/3/4/8/134896151/rukegurisitif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405903/normal_5fee8160d919e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416660/normal_5fff19e6e5379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387419/normal_600a0345f0bee.pdfIn PDF document text
    • https://gorimulokubev.weebly.com/uploads/1/3/1/4/131438265/zijudiduvesixevolu.pdfIn PDF document text
    • https://nowuvufeguxebib.weebly.com/uploads/1/3/2/8/132814980/3143022.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408348/normal_5feb337d0a7db.pdfIn PDF document text
    • https://wisetigu.weebly.com/uploads/1/3/4/3/134357320/vozuvekomot.pdfIn PDF document text
    • https://lurofajar.weebly.com/uploads/1/3/4/1/134131478/7595886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_6066d27106b41.pdfIn PDF document text
    • https://nokogijesa.weebly.com/uploads/1/3/1/4/131452879/12e103a6053.pdfIn PDF document text
    • https://mubaxuru.weebly.com/uploads/1/3/4/6/134693734/xotudedavevin.pdfIn PDF document text
    • https://dipibuwedaji.weebly.com/uploads/1/3/5/2/135293441/8019133.pdfIn PDF document text
    • https://wivixilor.weebly.com/uploads/1/3/4/3/134371520/rusumajizixi_wusurubuzo_towowawuled.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa1e3c23-9ee9-40d8-b3c7-cbd478a985c4/fanon_the_wretched_of_the_earth_on_violence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d41ceea4-30c8-4e18-ae86-88aaa835611e/acronis_true_image_with_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7774fbcf-cc0f-4dd4-a9d9-7c3d8fe062e0/tatadobos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f88f5b8-d5bd-4719-a02e-992515d6f019/catch_me_if_you_can_book.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 5164 bytes
SHA-256: db376d96ab02700c68b43701097b5edb02aa0355f31f1679ad10e9f2f2e97df9
font_01_sfnt_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 12480 bytes
SHA-256: 9602d7aaa1a34a724c2028a4b2ad98b449790259409d975b147a1b92429250e0
font_02_sfnt_off000127f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F6 16260 bytes
SHA-256: 480d94d6dd661c38cb068895e8aae984867fc97f4b2a3e15e0646101d6fe0848