Malicious PDF — malware analysis report

Static analysis result for SHA-256 af29ff0112c2ee4c…

MALICIOUS

PDF

79.9 KB Created: 2021-03-17 14:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 442a59f96c645b4b3b5aa6d2fd42227b SHA-1: f4a45ace54e0fd0a5c5511e1a7d7b3bf49a238ad SHA-256: af29ff0112c2ee4ccb0785bca9f6d3f1ce15489301849026a09d327c5231c850
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://druttle.ru/award?keyword=best+answers+to+interview+questions+pdf PDF link annotation
    • http://dadevizevarek.scienceontheweb.net/learn_coding_for_free_reddit.pdfIn PDF document text
    • http://jerunuju.mypressonline.com/genesis_from_genesis_to_revelation_box_set.pdfIn PDF document text
    • http://ctuxuu.com/231915232557swyf.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/zuwurazoku.pdfIn PDF document text
    • http://zegiwire.sportsontheweb.net/zakopevita.pdfIn PDF document text
    • http://trujillostacoshop.com/what_is_a_good_size_dehumidifier_for_a_basement2bjne.pdfIn PDF document text
    • http://se-mrush.com/hacer_manualidades_con_botellas_de_vinornafr.pdfIn PDF document text
    • http://opendouche.xyz/lg_true_balance_washing_machine_top_loadsqv7n.pdfIn PDF document text
    • http://varietystore.website/35009495306rxx3a.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/sabegokek/jiketelidik.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_5c33e909b5cc440082f9b7bc831180e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/48223673112.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/adobe_converter_offline.pdfIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_be997a12e95844b0b5665fb08b625c46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/zexozuj.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/ocarina_of_time_n64_and_3ds_differences.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/7232513733.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/calligraphy_handwriting_book.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/fexapitudunadojogurazujaw.pdfIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_abb3b2715e5e4cb6a2c4a7c8dcce911e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/pemagiziferevatarulejose.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_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 5328 bytes
SHA-256: aa37829e7c7d937518193672ed307d4de029181b6528fb994c711182ad171d81
font_01_sfnt_off00010f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1D 10544 bytes
SHA-256: d7a426b7fb90d66f24d9662698780f975b0e0be3662d4956f59f6a5c9fc78635

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