Malicious PDF — malware analysis report

Static analysis result for SHA-256 dafd40074faaf4e8…

MALICIOUS

PDF

82.1 KB Created: 2021-02-23 08:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5d81faae39c4623b50122760672ddbf7 SHA-1: 85c0bf284e91a773d87f0d43ea06354a4f865570 SHA-256: dafd40074faaf4e877735d0f7c98fdfc719499d3889715b7c5dacd7ff10863fc
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate a malicious intent to redirect users. The ClamAV detection and ML classifier further support the malicious classification, suggesting this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crophysi.ru/wix?keyword=the+complete+halogen+oven+cookbook In PDF document text
    • https://cdn.sqhk.co/luxixumogez/Jvjg9lc/ncaa_rowing_championships_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/jbHMgcn/how_to_sharpen_chainsaw.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/MjiKSFk/usa_today_live_scores_odds_and_matchups.pdfIn PDF document text
    • http://nosetibadap.iblogger.org/zenebiwig.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/edvjagj/asmr_darling_breakfast.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/hhhjghj/offroad_suv_drive_2019.pdfIn PDF document text
    • https://gisafumeg.weebly.com/uploads/1/3/6/0/136098567/nifafigil.pdfIn PDF document text
    • https://cdn.sqhk.co/kulukopupiw/pjbsig6/pixel_swordfish_io_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/8pdWRAy/brimming_synonyms_words.pdfIn PDF document text
    • https://mepokebifonamos.weebly.com/uploads/1/3/4/0/134096039/7054641.pdfIn PDF document text
    • https://cdn.sqhk.co/bimonabozo/iDgfiai/halloween_basketball_legends_unblocked_6969.pdfIn PDF document text
    • https://cdn.sqhk.co/sulugedako/hqJYgcj/63584554221.pdfIn PDF document text
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/diboneva.pdfIn PDF document text
    • https://cdn.sqhk.co/womilepeba/jiicCha/hotel_story_resort_simulation_mod_apk_latest_version.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lumixi/mujidezikanoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/bowirofaku.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/fixotibodoxafegumi.pdfIn PDF document text
    • http://mepusafufeja.rf.gd/mivilitewapumuki.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_off000104ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 5288 bytes
SHA-256: fbb39fab2bcd759ac62d1f4462e4e292faa09474cfdde67714d94984d6ca31a8
font_01_sfnt_off0001168f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168F 10660 bytes
SHA-256: 3373926c3121ad5ab12b933369a657554d17ef134de83adf85c8336e2db9d882

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