Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a04aac75aeba2b2…

MALICIOUS

PDF

77.2 KB Created: 2021-03-28 11:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b63f1d05ff6c637baa14a28c74749d85 SHA-1: d1d6843d28da04279cc58714af38292dbc12183b SHA-256: 2a04aac75aeba2b2c9d520bcd164babf1de69406f5cb22bec31d307d6b7e207d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The presence of a large number of external links, particularly the 'PDF_SEO_LINK_FARM' heuristic firing, suggests a tactic to manipulate search engine results or redirect users to potentially harmful sites. The embedded URLs and the overall structure point towards a phishing or content-farming scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bologen.ru/wix?keyword=independencia+dominicana+1821
    • http://detonic-romania.website/56001752144095tu.pdf
    • https://rozinezo.weebly.com/uploads/1/3/1/6/131636990/9995782.pdf
    • http://indital.fun/79074337107lssl6.pdf
    • http://winovigamaj.mygamesonline.org/refodopunepadafuxeme.pdf
    • http://giwitap.getenjoyment.net/tusaneniluvizetefe.pdf
    • https://sabitafev.weebly.com/uploads/1/3/4/3/134308069/tutuxadepuxaz_wupere_zezijew.pdf
    • http://nenodipemuxok.mypressonline.com/el_causalismo.pdf
    • http://worelimupuvefam.mywebcommunity.org/how_to_use_a_scosche_wireless_car_charger.pdf
    • http://smartcreditcheck.info/frostpunk_refugees_survivor_guidehn6rt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://febejesibek.rf.gd/gerusiluselux.pdf
    • http://zipodanej.rf.gd/nutobesapa.pdf
    • https://uploads.strikinglycdn.com/files/33279567-d4c3-4e4a-80e0-a467f569f0d3/how_to_learn_programming_languages.pdf
    • http://raxajabidadida.onlinewebshop.net/68551408498.pdf
    • https://uploads.strikinglycdn.com/files/f7c43cb5-a244-43d1-9a13-37b29f7076ac/strongs_concordance_4444.pdf
    • https://uploads.strikinglycdn.com/files/d17b704a-4fd7-4b02-b488-6c72c2267647/is_the_kobalt_table_saw_any_good.pdf
    • https://uploads.strikinglycdn.com/files/ba77207d-f6e7-418a-a06c-deb010c35881/62132454512.pdf
    • https://uploads.strikinglycdn.com/files/fe4815da-6fb5-456a-904b-0a6a296631ed/what_are_some_inspirational_speech_topics.pdf
    • http://bevamixebigal.epizy.com/84728390208.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_off0000f029.bin
b0782df356621f9b58189d7426c669e6ad0b904095bca6598989e7f617c3f546		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 5228 bytes
font_01_sfnt_off000101e6.bin
0cc72c69c4f8c8a1691db6a8ebb651152f74d60fedf12dcc9c4558e4be16f72e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 11272 bytes

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