Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20df7e9c972dd8a…

MALICIOUS

PDF

72.4 KB Created: 2021-03-27 17:31:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 488cb5fea60d48edf216fff73b030b6b SHA-1: c5a4e860351f999badf0aae8f34442b14193d963 SHA-256: a20df7e9c972dd8a27118867f6396ca6f8e07c2847815679f0620fe6af87eeea
254 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to redirector infrastructure, including a critical finding of a link to dafemum.ru. This suggests a phishing or scam attempt, likely delivered as a spearphishing attachment. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=barter+system+and+its+difficulties+pdf In PDF document text
    • https://cdn.sqhk.co/zovitamojim/tuheiam/assembly_warehouse_sale_sydney.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/ijhcCgd/82018477213.pdfIn PDF document text
    • https://bimotevos.weebly.com/uploads/1/3/4/2/134234596/penuvugaf.pdfIn PDF document text
    • https://bodijoso.weebly.com/uploads/1/3/1/3/131380183/fofiwe-gomugurekokuf.pdfIn PDF document text
    • http://damvglaz2.xyz/nexotobuzenekewog92m6.pdfIn PDF document text
    • https://cdn.sqhk.co/supekolev/hirwVge/36465051342.pdfIn PDF document text
    • http://rekatilugo.iblogger.org/44055957235.pdfIn PDF document text
    • http://hargotel.xyz/75575950388se13v.pdfIn PDF document text
    • http://psyhologrzn.ru/vekajibedotanozipn0q1.pdfIn PDF document text
    • https://cdn.sqhk.co/xonizarisu/NUhcibT/siwugam.pdfIn PDF document text
    • http://rapoxarawiwalo.sportsontheweb.net/79861334882.pdfIn PDF document text
    • http://igbusinessabouthelp.com/best_etl_tools_in_2020xngma.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/how_much_do_private_investigators_make.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/64125266077.pdfIn PDF document text
    • http://duwamiwimi.rf.gd/asrm_guidelines_for_female_infertility.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/semadevefadilosufodivedap.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/91879759513.pdfIn PDF document text
    • http://jabelakejirer.epizy.com/72990933515.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/35752912274.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/6300822986.pdfIn PDF document text
    • http://kogorokexo.rf.gd/mofudanutuzagajububuj.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_off0000de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 5452 bytes
SHA-256: a68e40e878d5a016d973289d86256514c1651c4641084908f28609f6b76bfbd9
font_01_sfnt_off0000f09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 10376 bytes
SHA-256: 6f0d0eb77bcc62bd2e491e3e2bec7ea7d8224fda96c207e69da5da4a00253a2f

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