Malicious PDF — malware analysis report

Static analysis result for SHA-256 302864eab46e0709…

MALICIOUS

PDF

94.3 KB Created: 2021-03-15 11:07:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c05ea43cd75be432d57c92e2a3d085f2 SHA-1: 118c6815a7df9cefee2f00e755779b25921498cb SHA-256: 302864eab46e0709d866cf337d64d844c12b8efe46c821596557b14b09835533
244 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. ClamAV also detected this file as Pdf.Phishing.Trojan. The embedded document body text, though heavily obfuscated, contains metadata related to 'wkhtmltopdf', suggesting it was generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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.
  • 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.
  • 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=weight+of+corrugated+asbestos+cement+sheets In PDF document text
    • https://wesedujixezibo.weebly.com/uploads/1/3/1/6/131606467/8144786.pdfIn PDF document text
    • https://wosixuluwur.weebly.com/uploads/1/3/1/0/131071196/revene.pdfIn PDF document text
    • https://rupubonu.weebly.com/uploads/1/3/0/7/130739332/7091b5d8e77446.pdfIn PDF document text
    • https://kivowitu.weebly.com/uploads/1/3/4/7/134703836/paforoxike-bufogezo-zaguti.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/bSjh8gf/avenza_maps_sdgfp.pdfIn PDF document text
    • http://sweetygirl.club/61939389670oapiu.pdfIn PDF document text
    • https://diwimiwiwomenen.weebly.com/uploads/1/3/0/9/130969795/varomojiril_bawiladefuxadi.pdfIn PDF document text
    • https://cdn.sqhk.co/felagarexug/Sjfjejb/xikarufobumapul.pdfIn PDF document text
    • https://golagunowij.weebly.com/uploads/1/3/2/6/132695575/wexijax.pdfIn PDF document text
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/doburedawakep.pdfIn PDF document text
    • http://dress-russia.ru/73440904036lx1yb.pdfIn PDF document text
    • https://boginajidu.weebly.com/uploads/1/3/4/6/134693166/sadubodis.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/jhvja2P/nejimilile.pdfIn PDF document text
    • http://yandex-delivery.cc/zamujuragijiwoszlpa.pdfIn PDF document text
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/gawezawepe.pdfIn PDF document text
    • http://cooldomen.space/sorepilakujotozasg1upz.pdfIn PDF document text
    • https://jurazevogepepa.weebly.com/uploads/1/3/0/9/130969245/gifozofigukexole.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/19c5c65a-1bec-478f-97b3-5a3ea03cf66b/37603637600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b1326b-7628-4188-be69-2b5a16383100/lelakinerupirim.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_cfcc8e9fe83440c09be4426362a5f9a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/612d4388-d46a-4063-9d96-a6c801d9f5b7/ds2_faith_weapons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d7a0e1-39a7-480e-9818-8d4028c4862c/43101063013.pdfIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_8222aea448a444aa87d63d12eb549ce0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ca52d82-29a7-4046-97c9-5cb89b29de62/hornady_223_75_gr_amax_load_data.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001212c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212C 5436 bytes
SHA-256: a15a1b68dfb140b8ef51b4197f7246ecf41eba57e5f76b368026b80f02fc8a2f
font_01_sfnt_off00013391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13391 12344 bytes
SHA-256: 5d549f01009df2137ec1c3b2857726b973645596ba4f2fb71038847b994c8e64
font_02_sfnt_off00015d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D2C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f