Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50dd3154b74c5a3…

MALICIOUS

PDF

92.6 KB Created: 2021-03-27 21:46:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: af3842e9d5bbae91cb4bda849bc053c7 SHA-1: 2718565cdfcb5bcbcc1635546ff52edf9bd1abbd SHA-256: f50dd3154b74c5a350a34c80edc38a9b399db4dc86db11867cc3c282edc1de5c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicative of a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and heuristic firings point to the use of embedded JavaScript for redirection or exploitation, commonly seen in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/award?keyword=biedermeier+literatur+pdf PDF link annotation
    • https://cdn.sqhk.co/nogugojuri/g2vUjhZ/piluvugodisuxu.pdfIn PDF document text
    • https://nudikiwo.weebly.com/uploads/1/3/4/0/134042489/19358e.pdfIn PDF document text
    • https://tepimetasufiro.weebly.com/uploads/1/3/4/0/134012902/siguvo_nogifaleloru_mizelexixize_segive.pdfIn PDF document text
    • http://fosireditoj.mygamesonline.org/can_i_dye_my_hair_with_splat.pdfIn PDF document text
    • https://regurawuxafedan.weebly.com/uploads/1/3/0/7/130740517/8c614118941.pdfIn PDF document text
    • http://zagozogenef.sportsontheweb.net/what_black_movies_are_on_netflix.pdfIn PDF document text
    • https://bowonalixatan.weebly.com/uploads/1/3/5/3/135347428/e7f16fb85998887.pdfIn PDF document text
    • https://fixemebipufuw.weebly.com/uploads/1/3/4/1/134131586/pizividugudaju-dedowerutomapa-pegotudaj.pdfIn PDF document text
    • http://kuviruvada.getenjoyment.net/xizuja.pdfIn PDF document text
    • https://cdn.sqhk.co/dubibuwa/3a9xKji/50468775946.pdfIn PDF document text
    • https://zawiwiguxasawum.weebly.com/uploads/1/3/0/7/130739629/a21095b22a5d6.pdfIn PDF document text
    • http://ninomut.sportsontheweb.net/most_powerful_positive_words.pdfIn PDF document text
    • https://kisujaxu.weebly.com/uploads/1/3/0/7/130775962/60bdc5444b62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_6b14879b7fca43a189d76db4d9c2878f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82398e33-f607-41b1-833c-dc14af8c2130/6124491669.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_5157a0c91f66416ba46a3c86b8ac3c0c.pdf?index=trueIn PDF document text
    • http://zevesijuduma.atwebpages.com/77819610820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a3d7a25-a42f-4402-95b5-73de9e1528f7/turning_an_equation_into_slope_intercept_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0214186e-f5a3-402b-9279-a4422de4b56b/boxevuku.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_7453004ff2cb4207980c0bffd8e0dbae.pdf?index=trueIn 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_off00011a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A12 5056 bytes
SHA-256: 4860e350386a406632cb034cb876b2f379972c56b2ab329281d353d9662ccc6c
font_01_sfnt_off00012b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2A 11524 bytes
SHA-256: f990ed36ec54084b97671c7735fb891f8c06880fab5b6bd1243454e4a9a4b52f
font_02_sfnt_off00015103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15103 16084 bytes
SHA-256: a3b8ae6cb61a975f1aaa3bdf1d75290c2750726bc6c8d8b6ec62e4e9f5cc9978