Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ac03a2c4da01dc…

MALICIOUS

PDF

92.8 KB Created: 2021-03-27 14:37:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1f1d556e15cb210131ea93cbe3434d3e SHA-1: 144e1cb91304974eff072c77971a960c7bbb7958 SHA-256: 79ac03a2c4da01dce1450a8d1ead31715c6841759b8558a5ca5f4c855a209394
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://soxebez.ru/award?keyword=neoclasicismo+literatura+caracteristicas+pdf PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wunojipu/bhai_behan_shayari_status_video.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/92760988554.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_c3dc7e9f4d99425cbe1e451151602dce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/welanisowari/torujux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f9cf63-d14d-4971-9e5b-91b54bb4269d/cards_against_humanity_expansions_in_order.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_5efa5691126e41288b4d411ddfa51af0.pdf?index=trueIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_d639e95e43114b999c35c6abdae89e99.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e63c64b5-01c8-44bc-b9bb-736fc6a79797/indoor_pickleball_rochester_ny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed360c7e-ff5a-4832-ad44-49ee781e731d/28742443149.pdfIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_e22ee571eb2d40f380d5721d09549c64.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/us_army_recruiting_badge.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/low_calorie_food_list_in_tamil.pdfIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_acde06b58090448f84105c6a3859300f.pdf?index=trueIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_eb07be03095048babb75ea97aa1f36fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/adobe_acrobat_pro_dc_to_word.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/harry_potter_book_6_hardback.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_off00012826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12826 5268 bytes
SHA-256: d3c5b155c26e888d462072b9705db2b65fbc789b9b0b348d8b3efff97ba5d56c
font_01_sfnt_off00013a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A00 13536 bytes
SHA-256: 3bf6c0bd5dca2b7e3f2acde61c1b807ef297b3406e901a162feb4b119fd60de7

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