Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a350ac31e57f2c1…

MALICIOUS

PDF

78.9 KB Created: 2021-04-23 04:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdc4341e46bdf52344d68ea3a39bae27 SHA-1: b3ccf0c52fe09f8a868293bc4f98923828b41251 SHA-256: 3a350ac31e57f2c174980b74158de4650f87feeb88a84c6be28018fe1adfd893
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The PDF contains a large number of external links, suggesting a link farm or phishing attempt, with one URL specifically mentioning 'sabbath school lesson guide outlook' as a lure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/strik?utm_term=sabbath+school+lesson+guide+outlook
    • https://cdn.sqhk.co/moromasi/BXijVhe/vera_bradley_weekender_duffel_bag.pdf
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/wakeri.pdf
    • https://zobadesozuxuj.weebly.com/uploads/1/3/5/3/135326391/0215844d3b4.pdf
    • https://bomefojidog.weebly.com/uploads/1/3/2/6/132695402/fd1f8844524e1.pdf
    • https://cdn.sqhk.co/purorenutuw/jeBg0G1/11124289485.pdf
    • https://kenagikapafixop.weebly.com/uploads/1/3/5/3/135301514/8051815.pdf
    • https://cdn.sqhk.co/foxoxaze/jd6jd2H/webcomics_mod_apk_unlimited_coins.pdf
    • https://faruroju.weebly.com/uploads/1/3/5/9/135986438/motufovulune.pdf
    • https://cdn.sqhk.co/vixemujomu/jgGjcC7/52573780254.pdf
    • https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/pejirijulozodib-dewizatomimera-poduruzi.pdf
    • https://cdn.sqhk.co/lobinazema/IggggFP/dovegidapezijirezemagu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e26146e2-9cc7-4609-92b2-a333ad9ec2a1/how_much_does_it_cost_to_get_an_exhaust_welded.pdf
    • https://uploads.strikinglycdn.com/files/13e2c8e2-2aa1-4944-a73a-aa9ad3072306/16760058084.pdf
    • https://s3.amazonaws.com/nodetuxapabara/how_much_does_a_chick_fil_a_general_manager_make.pdf
    • https://uploads.strikinglycdn.com/files/780360ec-0dac-4f52-b631-8b66a9dc4317/xudeguzimalowabarasawez.pdf
    • https://uploads.strikinglycdn.com/files/7c2b2bb4-4138-4219-a544-cd0de6b84cdf/how_to_connect_two_jbl_flip_4s.pdf
    • https://s3.amazonaws.com/tufujifinobiro/free_book_folding_patterns.pdf
    • https://uploads.strikinglycdn.com/files/35483a2b-7b2c-4b2c-bffd-0fc1759538b2/how_to_change_keyboard_shortcuts_in_premiere_pro_cc.pdf
    • https://s3.amazonaws.com/posufij/gofadinaw.pdf
    • https://uploads.strikinglycdn.com/files/75c0c6dd-7104-4220-bb6a-f5f34ae981d1/how_to_clean_danby_air_conditioner_filter.pdf
    • https://uploads.strikinglycdn.com/files/90bdb666-8f19-42f0-893b-70921a2efb30/52787994966.pdf
    • https://uploads.strikinglycdn.com/files/09e459ad-ac70-447a-bba5-60a8553eff04/36817600956.pdf
    • https://uploads.strikinglycdn.com/files/ff0972ce-662b-4f44-b147-4dc7d40aadb2/rupogamusiwefexilazu.pdf
    • https://uploads.strikinglycdn.com/files/c35edb30-f02f-42c2-8e29-63947e73949a/us_bank_saturday_hours.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_off0000f818.bin
3f2d87cce847900444fedb691514ceaa523bb1c8bd1c75ad7cfc95afe2262b85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 5412 bytes
font_01_sfnt_off00010a73.bin
3510c0457c4bd817d7b9ccf53de7fa8438074fc18156939f692e86fe9338b062		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A73 10480 bytes

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