Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab70e73af9347313…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 02:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53f0563b2efabb3b82ff74cc70511353 SHA-1: 19033dae8e952f3f7df8ff5a255fbb8f9d62d5bd SHA-256: ab70e73af93473134d563d0293015b8b53c287a761ff46d92a7bff4726a28469
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The presence of a 'link farm' heuristic and multiple unknown reputation URLs strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the ML classifier and ClamAV detection point to malicious intent, likely involving the exploitation of PDF vulnerabilities or the delivery of malicious content via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://gamjagolla.com/uploads/files/pifubiteriteb.pdf
    • https://southernwashpros.com/nbloom/fckuploads/file/70251133228.pdf
    • http://paolacaone.eu/userfiles/files/rewarusogitiwudet.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/22874caf925c4f126f9d61ee814c08ee/ponaxo.pdf
    • https://palcev.ru/userfiles/file/1862700948.pdf
    • https://west-holding.com/userfiles/file/pavoxaxumegalator.pdf
    • https://xylemleads.com/userfiles/file/6141422302.pdf
    • http://tuzy.pl/Upload/file/77138118299.pdf
    • https://tp-pos.com/uploads/image/files/fuwosiwudasaforunuzeroj.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/xunizufinisoziliwubid.pdf
    • http://www.lebedosapartotel.com/data/yukle/files/pegaroloneno.pdf
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/musisofitasa.pdf
    • https://canevastoilestjean.com/upload/editor/file/wotigejibolikanapiw.pdf
    • http://voszveszprem.hu/_user/file/riwub.pdf
    • http://chipgene.com/image/files/20210902_172715.pdf
    • https://texasbordervolunteers.org/userfiles/file/10252874548.pdf
    • http://deborahkay.com/ckfinder/userfiles/files/vudulekozirar.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0de2739cdec27cc4cb91f2220c3268aa/39026501669.pdf
    • http://www.gulbaharsigorta.com/contentData/file/rudukebikixeravalij.pdf
    • http://mandarinusa.com/userfiles/file/1630982833.pdf
    • http://anadolumatbaa42.com/genelresimler/file/97758585950.pdf
    • https://tapuionoticias.com/ckfinder/files/fojugixoxipi.pdf
    • https://successalpha.team/upload/files/5999981600.pdf
    • http://elskup.pl/images/assets/file/jakadotozejagewujevidewo.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/30662985628.pdf
    • http://cistenivytahu.cz/upload/file/12886275722.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=answer+to+question+56+on+the+impossible+quiz
    • 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_off0000db20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 16792 bytes
font_01_sfnt_off0000f332.bin
dcf4c578a46ddb28758a20f5acaf59e6635441bf52d20c1e71a1787625e65505
pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 17480 bytes
font_02_sfnt_off00012043.bin
0830636ecdddd7d1ebfa8f7900663cc888621a4142f166d2a16d6fbd8e404a9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12043 11168 bytes