Malicious PDF — malware analysis report

Static analysis result for SHA-256 0953e5b2f63f2496…

MALICIOUS

PDF

72.1 KB Created: 2021-03-09 21:10:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8c4703d48301c27c04ebd32df83bdd3 SHA-1: e3be8f590e22ae1c6ed583bb62d61f14e74b3a35 SHA-256: 0953e5b2f63f249668c3bb188cf1b4b5a78d0989e2f34899b54d43d5c11dda45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to SEO-optimized PDF documents hosted on free services. This behavior is indicative of a link farm designed to manipulate search engine rankings or distribute malicious content. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/123?utm_term=sixth+grade+fun+worksheets
    • http://strongcreditscore.info/how_to_set_temperature_on_a_norcold_refrigeratortvkia.pdf
    • https://wegenagozej.weebly.com/uploads/1/3/5/3/135394478/a4ca6.pdf
    • http://xamojofar.22web.org/animal_encyclopedia_online_free.pdf
    • https://zodoxofavuzawa.weebly.com/uploads/1/3/1/4/131437464/gipetugilowafaviwu.pdf
    • https://cdn-cms.f-static.net/uploads/4455902/normal_601bfd22c5c54.pdf
    • https://vetasokimatajed.weebly.com/uploads/1/3/5/2/135296406/94889051.pdf
    • https://jebigifapiw.weebly.com/uploads/1/3/1/3/131379276/zexanegod-wojalurikapaf-kenew.pdf
    • https://bigorofepomibed.weebly.com/uploads/1/3/4/4/134400252/punezuked.pdf
    • https://topigofifudonif.weebly.com/uploads/1/3/5/3/135304546/daromemuxowolebuzene.pdf
    • http://wwbook.org/23907958318pexn5.pdf
    • https://lavovozanu.weebly.com/uploads/1/3/0/7/130739022/1165928.pdf
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5fd6360355282.pdf
    • https://cdn-cms.f-static.net/uploads/4367665/normal_601bb00b257f6.pdf
    • http://expressday.online/cow_jumped_over_the_moon_song_lyricsp3m6w.pdf
    • http://lepasipun.iblogger.org/motorola_one_android_one_caracteristicas.pdf
    • https://cdn-cms.f-static.net/uploads/4410432/normal_6019645c6b141.pdf
    • http://mini-cam-v2.club/69764542378n4j15.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://givaxolek.epizy.com/what_is_the_best_monsterverse_movie.pdf
    • http://jusudab.epizy.com/80379357764.pdf
    • http://tonubugiloroluv.rf.gd/penny_stocks_on_nasdaq_and_nyse.pdf
    • http://jogekofasi.rf.gd/65050378801.pdf
    • http://sujemepis.epizy.com/morasekanegepamovata.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_off0000dcf6.bin
12a275f7a0e58f742a7ea61a1944c0ca3a44d6e035d6570ca6f0b0d9a2f98b60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 5464 bytes
font_01_sfnt_off0000ef9b.bin
b7297cb35908b5409c63c4d711f581beac299b3cf531b04db39634968bad4dc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 10496 bytes

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