Malicious PDF — malware analysis report

Static analysis result for SHA-256 2270b499a4ebf504…

MALICIOUS

PDF

80.6 KB Created: 2021-03-24 18:06:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35a9da3369da0351d3cb8a4c60397160 SHA-1: d1e94f03c2e32a42be067b1476982db570803f21 SHA-256: 2270b499a4ebf504f4c3c8fdc6f3d926d416f5efa29e408dacf614527f9d62f4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of a large number of external links, particularly those pointing to Weebly and other free hosting services, suggests a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

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://golowaki.ru/123?utm_term=ann+maria+kalippilaanu+full+movie++mp4
    • https://lusenivusimutom.weebly.com/uploads/1/3/4/8/134887898/gozabupewe_lukuvoragi_tinusezobuji.pdf
    • http://gekenig.mywebcommunity.org/how_to_restart_netgear_nighthawk_router.pdf
    • http://cancandance.org/56712887960thlbd.pdf
    • http://healthit.space/ninawofovifuzdl5yj.pdf
    • http://bred-enligne.com/storm_front_weather8mp5b.pdf
    • https://fenemonefozu.weebly.com/uploads/1/3/0/7/130739495/kimoka_sidimetejujux_tuxinebag_gafamopat.pdf
    • http://idealicaitaly.site/521031459801hysw.pdf
    • http://memowelubi.mygamesonline.org/alkene_reactions.pdf
    • http://ujjjrrrrr.space/905962748763w1xl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/viboxikuz/basel_iii_counterparty_credit_risk.pdf
    • https://s3.amazonaws.com/wewuxuviwar/superman_movie_hd.pdf
    • https://s3.amazonaws.com/jejulurowev/kupunosaxodutapowoxoj.pdf
    • https://uploads.strikinglycdn.com/files/5afeac7d-e1a1-4724-854c-7642f9206cac/cisco_rvs4000_specs.pdf
    • https://uploads.strikinglycdn.com/files/b739e996-9c4c-4f47-a934-61f05826c64e/mcdonalds_franchise_operations_manual.pdf
    • https://uploads.strikinglycdn.com/files/24bd49de-6850-4676-9e5c-ad54bad64529/difference_between_discuss_and_evaluate.pdf
    • https://s3.amazonaws.com/kukazowox/loliz.pdf
    • https://uploads.strikinglycdn.com/files/5807cf5a-f489-41f6-a1f3-6285088485bd/82105267770.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
    • 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_off0000e4d9.bin
330af4c0cf6c8a76dbb4c59bbe15340adcc3df780f2ae53aead8539bd389bce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 5068 bytes
font_01_sfnt_off0000f60e.bin
4f13740d085b26b32ecf3fdb250b82437d02f6e3887be98e43f4f03012bd670e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 13220 bytes
font_02_sfnt_off000120e0.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120E0 16164 bytes

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