Malicious PDF — malware analysis report

Static analysis result for SHA-256 53016a3c44d9b7d8…

MALICIOUS

PDF

69.3 KB Created: 2021-10-01 15:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9e3de804a4f8c02c825b4cadec23f5ec SHA-1: aa6ac009ed9a1789da9941b78ccbfe7852f1f11e SHA-256: 53016a3c44d9b7d82e5993541be0658f8fb9fe3e866d4d062e9cc8c5bff5c1d4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a password-protected archive lure. It contains numerous embedded URLs pointing to other PDFs hosted on disposable domains, suggesting a link farm designed to obscure the ultimate malicious destination. The presence of external URI indicators and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://philabc.ru/uplcv?utm_term=ping+mobile+lite+obb+file+download PDF link annotation
    • http://adams-gold.ru/archive/image/file/64123117775.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/39114757398.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/61064761812.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/19733585978.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acad527717.pdfIn PDF document text
    • http://195exim.com/datas/files/49338898990.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-12/20210912175416720463.pdfIn PDF document text
    • http://viorina-deko.com/images/file/18881168591.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/42539817970.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/fanajeragezik.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/zipodinunazijis.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/96640358571.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/nawamunorodosinatisurajip.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c37034f840---kumezarizezeveladasi.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/wudufenav.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/losiradabososom.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/vosotivisejavegorurix.pdfIn PDF document text
    • https://tipresentoio.it/images/file/bepugafezo.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///36711077957.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202191115253565.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/84990228040.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/vodeziwegadexogalixas.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/bosivila.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/59919874325.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DF 10656 bytes
SHA-256: d6d4485d164225dbe8c3b8c66839cce5bbb6e6acbec22489c4e4acee6b06f98d
font_01_sfnt_off0000cb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 16532 bytes
SHA-256: 81b3a88b21115b8db9cbaf404ca011245f991c0c70d10be42c8f43a67e2febca

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