Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed07421135e338d…

MALICIOUS

PDF

90.7 KB Created: 2021-03-19 18:36:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 9cc597556b60559e4b2fb3d80f35d189 SHA-1: 59277c1fa250874025204287514ffdae279e731e SHA-256: aed07421135e338db31bcaf40b5d8a0b5724dc5e00c54a0d31f5e6678f1e8f8d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://botokaw.ru/wix?keyword=the+lorax+science+movie+worksheet PDF link annotation
    • http://miwasigal.mywebcommunity.org/past_simple_and_present_perfect_advanced_exercises.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417046/normal_5feaff09398b5.pdfIn PDF document text
    • https://wijodemarivupi.weebly.com/uploads/1/3/4/8/134861972/cd4b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417670/normal_603bff9eb1222.pdfIn PDF document text
    • https://wubepifumemav.weebly.com/uploads/1/3/4/1/134109226/7105298.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368949/normal_60015aa182c23.pdfIn PDF document text
    • http://vonexalux.sportsontheweb.net/78755804342.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/how_to_invest_in_stock_market_philippines_2021.pdfIn PDF document text
    • https://jigupipugefelo.weebly.com/uploads/1/3/4/3/134387822/8309955.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sujidise.epizy.com/38915289636.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/how_to_be_miserable_book_review.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/jofiwekalagabubesuk.pdfIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_5b1c5518fe93402a8adf2bb924c0c595.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fukepez/repeated_addition_worksheets_3rd_grade.pdfIn PDF document text
    • http://zirururifikelo.epizy.com/should_tuition_be_lowered_covid.pdfIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_77ab20143bb84d44bc2bd09c8fcfbb59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/neviwove/vobarikapozomututasexe.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/52826115643.pdfIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_3a6d8b96ed5841e9abeeb97519d4af6a.pdf?index=trueIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/62923181163.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_off000124eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EB 5272 bytes
SHA-256: a136500fafd0477568d464a02182e46bb50796d43282fd238274d8f28d746835
font_01_sfnt_off000136bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BF 11864 bytes
SHA-256: 1b975b701b9ba58bf436e3301269d6ab42d963773602ae09c2e7c172a66b7aff

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