Malicious PDF — malware analysis report

Static analysis result for SHA-256 d021811d0305bb84…

MALICIOUS

PDF

76.1 KB Created: 2021-03-14 18:05:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a7554b77381d145421239039811e52ea SHA-1: 4f5f063d9e9b0b754e08a9a1dd3cbda86c6748f5 SHA-256: d021811d0305bb84455b9dc6aadcf05c7511dd7fd3d4ace90cd82301efc39ed1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://xajibur.ru/award?keyword=tamil+language+words+pdf PDF link annotation
    • http://numulul.mygamesonline.org/jibapegalexo.pdfIn PDF document text
    • https://wufanamokedig.weebly.com/uploads/1/3/5/3/135326106/walulevifujuzizafu.pdfIn PDF document text
    • http://wikowezenitezo.medianewsonline.com/painting_with_john_imdb.pdfIn PDF document text
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/womimubusawuz.pdfIn PDF document text
    • http://magazinrf.xyz/sebenixokedikipakuluqcvf.pdfIn PDF document text
    • http://alania365.ru/jekoguwofevazezanekugeposm7ud7.pdfIn PDF document text
    • http://uorott.com/83415958280jcfgj.pdfIn PDF document text
    • https://bobujiwa.weebly.com/uploads/1/3/1/0/131070874/vugobik.pdfIn PDF document text
    • http://sallles.ru/lfs_unlocker_s3_download50twg.pdfIn PDF document text
    • http://fakts.design/fuzaposurapawiwabig62a0v.pdfIn PDF document text
    • http://buytoday.cc/ableton_live_authorize.auzho71k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484834/normal_5fe9b97af3824.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481999/normal_5fe4d7dbbc2bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375507/normal_5fc7ee552a6f5.pdfIn PDF document text
    • http://zeropium.com/11596927517ilut9.pdfIn PDF document text
    • https://zumaninerotuz.weebly.com/uploads/1/3/1/6/131637595/431959.pdfIn PDF document text
    • http://delayikapy.xyz/the_hunger_games_catching_fire_watch_online_full_movie_free_hdjgyy1.pdfIn PDF document text
    • http://mebel-albero.ru/wulurakojujicb4e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xobofob.rf.gd/86841293091.pdfIn PDF document text
    • http://jiporeve.epizy.com/16619945360.pdfIn PDF document text
    • http://bajanibutibo.rf.gd/dalegakesenaregibazikow.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_off0000e857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE857 5404 bytes
SHA-256: 08172da2b3af19c07c0aa22195b58634816eace311ae87198e3b3ddbd21b496d
font_01_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 12208 bytes
SHA-256: 2f4f7e30afdc1e2616c09deefedd8de0618999e12d8b0178bc406efc9c287e71

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