Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b018deca64bd42…

MALICIOUS

PDF

76.6 KB Created: 2021-04-04 21:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 23187630773a74a288bf6ef6db6fbbe8 SHA-1: 26d03a61a9f18593fa071aa7bde578014ef72d91 SHA-256: 40b018deca64bd42c236aa1375d57c324ab5084c2c58bd469124c4010225734f
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and it contains numerous links to external websites, some of which are flagged as malicious redirectors. The document body, though heavily obfuscated, appears to be a lure related to 'si joint dysfunction stretches' to encourage clicks on these links. The presence of a link farm and redirector infrastructure suggests a phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=si+joint+dysfunction+stretches+pdf In PDF document text
    • http://nebo-baikala.ru/does_gamestop_ever_have_coupons984zl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387701/normal_5fce95e9c741e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_603187f0c1179.pdfIn PDF document text
    • http://ludshop.xyz/jovizikobodoxuxfadfz.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/dekitujo_loder_juzabavutas_tetumupowasam.pdfIn PDF document text
    • http://polikarmonolit.ru/how_do_you_play_the_game_liars_dicecxhx2.pdfIn PDF document text
    • http://idealica-italiaoficial.site/66416791919pxtmk.pdfIn PDF document text
    • http://gabojodidi.iblogger.org/ginofiribajavezosep.pdfIn PDF document text
    • http://leopolds.space/kakimixavaduzpyo5.pdfIn PDF document text
    • http://nokerigi.iblogger.org/cuanto_es_120_gr_de_mantequilla_en_cucharadas.pdfIn PDF document text
    • https://jujizifij.weebly.com/uploads/1/3/4/3/134309807/6213850.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/98fcdbca-37df-4e68-867b-c9b014b0d3bc/zavemafomulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81e1e5f1-c5b8-4a4b-bbe9-d773b76e6f53/85641402980.pdfIn PDF document text
    • http://sipitifijuju.epizy.com/92654303133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf5111c-df46-4182-bdd2-9c02f9958fcc/41790051889.pdfIn PDF document text
    • http://sufizewuwavibu.epizy.com/samsung_s8_plus_android_10_update.pdfIn PDF document text
    • http://pojaguteketifix.rf.gd/4220195045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e35288c-520b-4138-93bf-3b2ff3b16dc8/strength_training_and_cardio_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/725f5249-ea85-4282-acef-f4f1569f626f/insinkerator_garbage_disposal_home_depot.pdfIn PDF document text
    • http://nixuverojezuluz.epizy.com/lopetopedekuduwazerug.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 5280 bytes
SHA-256: 0829eb363c58259fc9b84ed3850a110c472354e09921485c1075964880a1c302
font_01_sfnt_off000101bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 10504 bytes
SHA-256: 1b289d0a3a86fe791e00f73162e196318ef48754fb333344e96787d33c777cfe