Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1153a2dd241f568…

MALICIOUS

PDF

104.7 KB Created: 2021-03-04 12:21:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 25f6887bc434e712f28bc92a7a0bec6d SHA-1: 81e4db54e3328567a2a6d3b2eb0dcb7b5cb71ecb SHA-256: f1153a2dd241f56818e091b3d872debbddec768328717983323612441f40eeb8
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirectors, indicating a link farm or phishing attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but no executable scripts were found.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://yafferge.ru/strik?utm_term=miguel+serrano+quotes In PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/xiduvix_gulubolusi_kivokaxib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413735/normal_602f4e467cc94.pdfIn PDF document text
    • http://zelopaqq.xyz/snapchat_2020_apk_free_downloadevjdo.pdfIn PDF document text
    • http://akfb.online/614986433034y08p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453537/normal_603ef04cf3148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471688/normal_60171423df281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497368/normal_6012f1a112b86.pdfIn PDF document text
    • https://putifunefam.weebly.com/uploads/1/3/0/7/130775131/winepegivemil.pdfIn PDF document text
    • https://kebedemozi.weebly.com/uploads/1/3/0/7/130775588/lesabope.pdfIn PDF document text
    • http://3gusevshop.website/814384681791cz7z.pdfIn PDF document text
    • https://tejenopaje.weebly.com/uploads/1/3/1/1/131164027/1635512.pdfIn PDF document text
    • http://okrasote.info/printable_52-week_money_challenge_to_save_5_000nejyn.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/veraxawewib/are_lockpick_sets_illegal.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/85448210399.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/unisa_application_form_for_admission_2019.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_off000145dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DC 4984 bytes
SHA-256: d12678d738881f6e0df2412af9030af558657bdc8d1bda7c0545facef5baa50d
font_01_sfnt_off000156ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156ED 12860 bytes
SHA-256: edabca89c036ac50e7986ca43d7b853bc9c5217689fdfb05155ccf77230b5253
font_02_sfnt_off00017f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F5E 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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