Malicious PDF — malware analysis report

Static analysis result for SHA-256 851a7d45a11cfb73…

MALICIOUS

PDF

76.2 KB Created: 2021-04-01 04:39:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bbc52da06de0b1801464d00df751d58 SHA-1: d80ba260f954a145a33f567bdd5518521b4e5773 SHA-256: 851a7d45a11cfb7327ada073705ee66f76d30c2eb438a5127fceb2520ac0c51d
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a URL that mimics a search result for 'Newsies musical libretto pdf', suggesting a social engineering lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/wix?keyword=newsies+musical+libretto+pdf
    • https://cdn-cms.f-static.net/uploads/4393181/normal_605c3bb81759a.pdf
    • http://kuboduzuke.mypressonline.com/rh_isoimmunization_in_pregnancy.pdf
    • https://static.s123-cdn-static.com/uploads/4423154/normal_5fcc2e4ae45ef.pdf
    • https://fopokefizig.weebly.com/uploads/1/3/4/5/134525302/3042756.pdf
    • http://tujemet.scienceontheweb.net/niwuratu.pdf
    • https://cdn-cms.f-static.net/uploads/4453532/normal_602e78a791fa0.pdf
    • https://cdn-cms.f-static.net/uploads/4368976/normal_603391aa52d5f.pdf
    • https://tunuwowidu.weebly.com/uploads/1/3/4/6/134606858/vijos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_07dd653ff6e441e2ae5d768c21eb0567.pdf?index=true
    • https://11e0ccb5-01dd-4757-ae93-f6f3b4f5ca32.filesusr.com/ugd/1a2ce6_952abe138dc34b3bb3603e13507b652a.pdf?index=true
    • https://s3.amazonaws.com/luramamelolem/kakubimuzokozifejano.pdf
    • https://s3.amazonaws.com/gogunabones/wamakogitaziserelugukazi.pdf
    • https://s3.amazonaws.com/tulosa/smart_antenna_book.pdf
    • http://nifusotajezunur.atwebpages.com/medical_demography.pdf
    • https://s3.amazonaws.com/xokebore/pemopufazowulupefin.pdf
    • http://seroritubofa.atwebpages.com/warhammer_40k_codex_space_marines.pdf
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_41d5f4a26e9e43b48a1b15cbafca5dfe.pdf?index=true
    • https://s3.amazonaws.com/xafaxotaful/80846772499.pdf
    • http://xovefopu.myartsonline.com/application_format_for_leave_in_office.pdf
    • https://s3.amazonaws.com/debamijizozexo/fuxuvuvubulufe.pdf
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_00dc3fc9cb3f4c34a0a1d88763a2ac50.pdf?index=true
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_9ae8a2cdd25c4876a2010d928310822d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de64.bin
16a0202c324968704496bfe29811428043d937eebbe8e9e9722dbb3d1dbf4ad5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 5276 bytes
font_01_sfnt_off0000f05c.bin
8d52b41e015eaf9ec8427f799363fd17bca80666a6b5e21baa1f4674dade7459		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 10668 bytes
font_02_sfnt_off000114a8.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114A8 4324 bytes

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