Malicious PDF — malware analysis report

Static analysis result for SHA-256 490681e6ba04ac29…

MALICIOUS

PDF

82.5 KB Created: 2021-03-03 00:02:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5088cfdb852d6d63ccc1fd91de4059bf SHA-1: 146be9b663d455156ae8208126a12ddca0f3bf18 SHA-256: 490681e6ba04ac29e10702bb306401c05384b9e002eaf4b865b625e67c4e948a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, appears to be a lure related to 'reiki practitioners'. No scripts were extracted, but the presence of numerous external URLs indicates an attempt to redirect the user to 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://crophysi.ru/award?keyword=how+much+do+reiki+practitioners+make+canada PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374380/normal_6002bbab00254.pdfIn PDF document text
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/56e9814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_602b6f18adf6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449992/normal_6034ce0895e5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379471/normal_603a0b005f0e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_5fd7664e54126.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385422/normal_6006ba6ea9602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419218/normal_6034c20965e2a.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://s3.amazonaws.com/lolaritemukole/69654366528.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/dynamics_nav_2009.pdfIn PDF document text
    • http://vabitiwobunena.rf.gd/is_regurgitation_the_same_as_acid_reflux.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/1890370181.pdfIn PDF document text
    • http://vitipazapabixu.epizy.com/boney_m_songs_free_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/tusuf.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/vunigeriwuvanumebopux.pdfIn PDF document text
    • http://lokunegop.epizy.com/what_does_voiced_and_unvoiced_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/rakufumazizox.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/battlefield_2_maps_pack_single_player.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/extravasation_chemotherapy_guidelines.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_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 5280 bytes
SHA-256: 1da0563a57f3f82f739494bbfdb3b69d646f6d2fe99055c150b25085ab6884b4
font_01_sfnt_off000106e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 12128 bytes
SHA-256: c5abf734ce872bc9b4e73db2c80de955b13fa212eb5456097a2a92782367cc1b
font_02_sfnt_off00012e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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