Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d9c45f8f8d4ef3…

MALICIOUS

PDF

90.0 KB Created: 2021-04-04 13:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9ffbf554db97d331c2006979324bf9b2 SHA-1: 134524ac71dc7afb6e23fe2ef8df40e8ba486c64 SHA-256: 55d9c45f8f8d4ef359839fd81519edf8236c485bbd63db4a0b1b08a18239e5cb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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.
  • 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://soxebez.ru/award?keyword=acls+pretest+pdf PDF link annotation
    • https://binufigelivu.weebly.com/uploads/1/3/4/7/134775083/potesidukobonol-kaditajewazezap-zemugokaje.pdfIn PDF document text
    • http://rixuliketasaban.mywebcommunity.org/27605881960.pdfIn PDF document text
    • http://dugarudewemudo.sportsontheweb.net/zudomixitavu.pdfIn PDF document text
    • http://rabiwitijif.medianewsonline.com/xojoz.pdfIn PDF document text
    • https://tetomorefaboma.weebly.com/uploads/1/3/1/3/131384600/305ea4a.pdfIn PDF document text
    • http://zofiziz.getenjoyment.net/20519818743.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/82653522148.pdfIn PDF document text
    • https://zunodeni.weebly.com/uploads/1/3/1/0/131070331/e15c8.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/levofujumutekowefimojoxu.pdfIn PDF document text
    • https://sejesomizibiji.weebly.com/uploads/1/3/5/3/135346687/tuwemepanan-dikagu-kilubo-sigikevokutemix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_3248a687e9094ce4b08efd9552b412f6.pdf?index=trueIn PDF document text
    • http://dubanexotokegel.myartsonline.com/caryl_churchill_fen.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_7ff6dd7738e84cbc945e1e71023d12c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/biela_manivela.pdfIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_8dcb9514295b4320b305be4885d25f64.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefovu/arby_s_nutrition_information_onion_rings.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_9da17a20d4124975bfe4a460252c746e.pdf?index=trueIn PDF document text
    • http://tameladizikep.atwebpages.com/12547131344.pdfIn PDF document text
    • https://3cde87c3-25ab-478b-b58d-ba072f1c7540.filesusr.com/ugd/255d97_cb33df4cb4bb46beb87d3bc8e77edb61.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_ddd5d5e05e4640bbaf4585c4d297f8fb.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_3863458ac27144b7ad378a6ad6df2904.pdf?index=trueIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_7329805a1f194557af90db14f99e2f22.pdf?index=trueIn PDF document text
    • http://nukivamo.myartsonline.com/traductor_de_portugus_a_espaol.pdfIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_d67eb275d0b44f7192739a728f588dc6.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DC 4452 bytes
SHA-256: ad4ed56f52b9ee53fed9effca2d1ae20769a67c39fc6f2cb406114e1da0b0d5e
font_01_sfnt_off0001260c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260C 11544 bytes
SHA-256: 56ec25461bc1b146416e9cea1d530fb6c9c8c317e7bda6fde933c7521de2224d
font_02_sfnt_off00014cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD8 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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