Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9b112ba3b45e86…

MALICIOUS

PDF

85.8 KB Created: 2021-04-24 12:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 074cd4e095e76d48a826eba7ebc23f71 SHA-1: 36f0c02f7fd598e3e5392225e9d314963440bf4f SHA-256: 9d9b112ba3b45e86c66c895bb827a7562f218dc84e429d7bdb2c3582a94b27c2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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

  • 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://leonvi.ru/strik?utm_term=re+zero+light+novel+volume+15+english PDF link annotation
    • http://fomijegi.mypressonline.com/80084746277.pdfIn PDF document text
    • https://nibapexi.weebly.com/uploads/1/3/0/9/130969889/a8fe10d4ff8635.pdfIn PDF document text
    • https://fofomakizu.weebly.com/uploads/1/3/0/7/130775640/5777126.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/ad7a01.pdfIn PDF document text
    • https://xobowosesij.weebly.com/uploads/1/3/4/6/134616182/vilinakode-xodadowevasewi.pdfIn PDF document text
    • http://bawilidow.mypressonline.com/69683200476.pdfIn PDF document text
    • https://xirofagoxo.weebly.com/uploads/1/3/4/5/134576207/813b8f727339af.pdfIn PDF document text
    • https://zidadosivifaju.weebly.com/uploads/1/3/0/7/130775619/gebuw-jupafikujolem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_aaa1cc16874b4458b8c60836749f0d07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78951eb0-9cbd-4919-adb0-bbbc78e9f9c0/2015_club_car_precedent_body_kits.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/baby_shark_invitation_card_template_free.pdfIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_0cc2eaf52b7b42a6a31962773adaeb0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/274abbbd-8d61-4b25-992f-771510e22b51/10294949934.pdfIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_43328e1e9004452f8017d75a303d9325.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe6c7433-7939-4e33-bf27-8d191b75d3e1/66465250932.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/92171364585.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off0001117d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117D 5184 bytes
SHA-256: dcdb9984fa459a81085d0d5494dced4d9f71a5eb82980f6623d479c2add3abf5
font_02_sfnt_off0001230e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230E 10720 bytes
SHA-256: 92476910e03a22260b0eb54c141bf5898680286cf2ef08b4f4e6dfbb6842dca6

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