Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5963949c6c074a4…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 00:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcc13e6462d1b7f92629f8a276ff65c2 SHA-1: 5c0ef2c7d658880a17ccb7c9a3719b1bebff1563 SHA-256: e5963949c6c074a4beebd35a0ad1474a62331519f9f9ece057e6f1d5ecef277a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a phishing or malware distribution attempt. The presence of external URIs and a link farm heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=play+store+root+apk
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/lixubudaxipeweforajese.pdf
    • http://dungcubepgiangtrinh.com/webroot/img/files/50194936044.pdf
    • http://88cpap.com/userfiles/files/8679407133.pdf
    • http://kuryakyn.ru/userfiles/file/53319727494.pdf
    • http://ganteltechnology.com/system/userfiles/file/gomikanuzeparewanudefodo.pdf
    • http://technocom.pl/editor/file/55439112931.pdf
    • https://aljuboori.com/userfiles/files/tufadegidebibabinugozu.pdf
    • https://aarushimukhwas.idealviews.com/userfiles/files/vojefililexubumi.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/xefefanafisek.pdf
    • https://strongpointmarketing.net/userfiles/file/1334151326.pdf
    • https://triosms.com/userfiles/file/98216110670.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318a3fd40ed---37149623662.pdf
    • http://bitite.lv/media/txt/122/file/wujofezipapowoxapaja.pdf
    • http://studiogalata.it/userfiles/files/rowekiwugapivududo.pdf
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/kiradazulan.pdf
    • http://nissanotogovap.vn/uploads/images/files/26934038799.pdf
    • http://danies.ru/ckfinder/userfiles/files/zomefatusazerufapenipufej.pdf
    • http://burmeseburmilla-allevamento.com/userfiles/files/gifixipivaz.pdf
    • http://buydecor.ru/uploads/files/59280564892.pdf
    • http://tjjjsh.com/uploads/files/nifobodujil.pdf
    • http://ydyb.com/filespath/files/20210903165153.pdf
    • http://nadafashionbelt.com/Uploads/file/61191157821.pdf
    • https://ibrahimkoc.com/images/Media/files/75387227096.pdf
    • http://yusungchart.com/userData/board/file/99990363725.pdf
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/doredudaxinekobovodonag.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d8ec0eb39---xolasoranolopadususubunuv.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd2b.bin
31cb3c1a91759bc61a18e709e7a650f2de606c118a104f13d9fdd5f04e293f52
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 10256 bytes
font_01_sfnt_off0000f483.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 16792 bytes
font_02_sfnt_off00010c95.bin
a6816157086ecee9688a370d8453de8693bf9b8699b91db464b3289511d5d841
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 17676 bytes