Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a2eff5ce0c3a8a…

MALICIOUS

PDF

76.3 KB Created: 2021-03-13 22:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 142a8550554840f926cf409ffbdca32f SHA-1: 287cd0b0d2c2ffc9eb11c65d0479b3c4bb242020 SHA-256: f4a2eff5ce0c3a8a655d6c7433a01eb23fc431649bd1ef156b2f16aad9709a30
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to SEO-optimized PDF hosting sites, suggesting a link farm or phishing campaign. The presence of a URL like 'https://gimoguvi.ru/strik?utm_term=lg+true+balance+washer+and+dryer' indicates a lure to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its phishing and trojan characteristics.

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://gimoguvi.ru/strik?utm_term=lg+true+balance+washer+and+dryer PDF link annotation
    • https://cdn.sqhk.co/xedufoga/gggebia/87984811767.pdfIn PDF document text
    • https://gisafonenum.weebly.com/uploads/1/3/5/3/135323636/b311c759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_601b1aff04a67.pdfIn PDF document text
    • https://cdn.sqhk.co/vomawoko/19Wotl0/enjin_bitcoin_ethereum_blockchain_crypto_wallet.pdfIn PDF document text
    • https://cdn.sqhk.co/norejasiwiza/c6yYjdH/gilolusepatolapezidatiz.pdfIn PDF document text
    • http://souve.me/zagoxebopugisapofezihoed.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/tavamifalaxoju_woweroketenu_favoturor_fufamepotaxeba.pdfIn PDF document text
    • http://artemk.ru/23485888901rgyav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454681/normal_5fccfd7b4fbb9.pdfIn PDF document text
    • https://xojexibawetu.weebly.com/uploads/1/3/4/3/134361221/rovegar-perera-kipeki-pukejovo.pdfIn PDF document text
    • https://cdn.sqhk.co/niwexifa/hejeWAB/golf_blitz_emotes.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/rutufokedizon/archiver_7z_free.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/88074131801.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/24231095200.pdfIn PDF document text
    • http://wawavubuwile.rf.gd/disney_animal_kingdom_map_2018.pdfIn PDF document text
    • http://zalaxorenisev.epizy.com/96053839193.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/70163168497.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/rivusurukojuv.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_off0000eca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 5476 bytes
SHA-256: ca1f9e2ac3653fb3d35b55fb0ed873c9442bbdb7e3ae15e5cbc1d299224eb119
font_01_sfnt_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 10836 bytes
SHA-256: a1c443a2fc447f63e271d27308ad3f402427a1e618e6030d25c8c13f95666eba

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