Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8cbf36252ea108…

MALICIOUS

PDF

80.6 KB Created: 2021-02-28 08:11:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60a793995ab310e16c5b040b63f869d6 SHA-1: 71a971660a357c8552b66c572cd66961298b0a6b SHA-256: de8cbf36252ea10830fff9cb61b319b30960c4f8de5129a68e71dd22348c228b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains or file-sharing services, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains keywords related to game downloads, indicating a lure to attract users to malicious sites. The presence of ClamAV and ML heuristic firings further confirms its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/wix?keyword=naruto+ultimate+ninja+storm+5+psp+iso+download
    • https://lewofadexireg.weebly.com/uploads/1/3/4/8/134868993/3053085.pdf
    • http://fodamibokaf.66ghz.com/rimixilugi.pdf
    • https://damajarulapo.weebly.com/uploads/1/3/0/7/130738748/936aeeccd18547.pdf
    • https://letanidopubiza.weebly.com/uploads/1/3/0/7/130775959/192bba96e576.pdf
    • http://lorewipa.scienceontheweb.net/husqvarna_323l_throttle_spring_replacement.pdf
    • https://wejuwano.weebly.com/uploads/1/3/1/1/131163718/vinezaxaz-xoxem-mobosobodinejem-biluxuvuxapu.pdf
    • https://ruwuragawani.weebly.com/uploads/1/3/4/3/134383911/447e442efd9f9.pdf
    • https://cdn.sqhk.co/rerunaropiz/hoKoGgh/another_word_hospital_room.pdf
    • https://nitomono.weebly.com/uploads/1/3/1/4/131454496/924736.pdf
    • https://vivuguduwidu.weebly.com/uploads/1/3/2/6/132681484/mozupe_wopubavurulez_benelesajepi.pdf
    • http://nigavereke.mygamesonline.org/pumped_up_kicks_piano_sheet_music.pdf
    • https://cdn.sqhk.co/ramawuvade/hfhjIib/cash-_n-_go_pawn_summit_il.pdf
    • https://cdn.sqhk.co/sigidezok/hfgdzGw/lomutabebaz.pdf
    • https://dibumofum.weebly.com/uploads/1/3/5/3/135313591/2316e1b61.pdf
    • http://lozosomegav.iblogger.org/zirevororukirolakuxowur.pdf
    • https://cdn.sqhk.co/ketejeti/ehbOhil/13566616364.pdf
    • https://cdn.sqhk.co/risenulowo/cD98Bx9/32166817151.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vifusupegiza/adjectives_and_articles_worksheets_for_3rd_grade.pdf
    • http://nisetekotixob.myartsonline.com/list_of_words_used_in_adverbs.pdf
    • https://s3.amazonaws.com/zetituri/unisa_online_application_form_for_2020.pdf
    • https://s3.amazonaws.com/vebogotexaf/nunowepopubizijupafig.pdf
    • https://s3.amazonaws.com/wipotegadodorek/lamip.pdf
    • http://gesasodalunaka.epizy.com/o_mio_babbino_caro_lyrics_sheet_music.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_off0000f521.bin
ab38e398571026f00249d670dba3415e8cf9a630bacd6620d3e323ea3322034f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 5368 bytes
font_01_sfnt_off00010762.bin
934e8237369db4261763038bf522d0fe1437a92b0e948b89bf57ac96a477219a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 14816 bytes

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