Malicious PDF — malware analysis report

Static analysis result for SHA-256 dabdbcf1c9ca93ce…

MALICIOUS

PDF

80.5 KB Created: 2021-02-26 18:53:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c9752e9dae833d5183b2eb147f41468 SHA-1: 7782cc1df1dd85b6b2bcadabfa4ec3a778afb1c3 SHA-256: dabdbcf1c9ca93ce4bf47df96a60b39d24b74605cc6ed3f03d903340f7f69e60
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing lure. The PDF structure itself is also suspicious, with duplicate object definitions, indicating potential obfuscation or malformation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=does+gamestop+buy+used+wii+consoles
    • http://lovelid.xyz/anomaly_detection_network_traffic_github6rg34.pdf
    • https://gaxatibixowoki.weebly.com/uploads/1/3/1/4/131452935/4174574.pdf
    • http://kasyanbeauty.com/42326404331bot2k.pdf
    • http://jevetimunuz.iblogger.org/is_moto_g_fast_4g.pdf
    • https://xazowivuxef.weebly.com/uploads/1/3/4/5/134513065/1887571.pdf
    • http://virona.org/loxojezorajiguvewip4hood.pdf
    • https://damujulul.weebly.com/uploads/1/3/5/3/135335913/pumesi.pdf
    • http://setofexperience.site/mbti_test_italiano8fua2.pdf
    • http://dolinunuridaku.iblogger.org/watenofixirepiral.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jigezilor/35620128892.pdf
    • https://s3.amazonaws.com/pazatuv/3505581591.pdf
    • https://s3.amazonaws.com/kujapomib/zivasulunejogabojebamos.pdf
    • https://s3.amazonaws.com/xufaxoferugod/rutagasuza.pdf
    • http://kitivej.epizy.com/cadillac_cts_v_performance_specs.pdf
    • http://zufarelizija.epizy.com/50442091356.pdf
    • https://s3.amazonaws.com/bezutu/conclusion_sobre_titulos_de_credito.pdf
    • https://s3.amazonaws.com/mosezavor/70116850025.pdf
    • https://s3.amazonaws.com/jamuluvuvava/einthusan_tamil_movie_hd_2019.pdf
    • http://xuwanozofugis.epizy.com/pfma_annual_report_2018.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa9e.bin
032fd8ef2483bbf4928ee8f2b36371c130f13d48dc52e41ff58b4d051a34b458
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 5628 bytes
font_01_sfnt_off00010dcb.bin
daf89f09e7f7d65e1c4f80651ab9ee4bd957470be57e4c1513bbaec9c3d6656e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCB 11280 bytes