Malicious PDF — malware analysis report

Static analysis result for SHA-256 24430ee0a9b0a0e5…

MALICIOUS

PDF

73.3 KB Created: 2021-05-19 12:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1d340fbd41d641b7ddfcdb04c499e45d SHA-1: 29381bfbdc8f3d53c2af718a8fed9a76a14bbd2c SHA-256: 24430ee0a9b0a0e5cf13b149dcd4f17d879182498908e9bd074a0a1532c275f5
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 0.9998

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://pelibifir.ru/strik?utm_term=how+to+write+a+letter+terminating+lease+agreement PDF link annotation
    • https://mutuwafidiz.weebly.com/uploads/1/3/6/0/136095616/tozexaragineza_jejam.pdfIn PDF document text
    • https://gagoxesuv.weebly.com/uploads/1/3/2/6/132681450/1605176.pdfIn PDF document text
    • https://josujobo.weebly.com/uploads/1/3/4/7/134713906/ripetivebomil_gixep_zuzap.pdfIn PDF document text
    • https://wurulukonena.weebly.com/uploads/1/3/5/3/135398735/mopajatefipeluveb.pdfIn PDF document text
    • https://sonalopuxarore.weebly.com/uploads/1/3/4/3/134310538/mison-mumonol-gubunilirezumus-begegixilevubek.pdfIn PDF document text
    • https://gipimosikiji.weebly.com/uploads/1/3/5/9/135963651/4790275.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/3676920.pdfIn PDF document text
    • https://puxikatekeji.weebly.com/uploads/1/3/2/6/132681322/taluniwo.pdfIn PDF document text
    • https://rapugudunoxe.weebly.com/uploads/1/3/4/0/134012743/a087cda9.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/toguvaju/amman_padal_songs_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8002f8d7-8909-4233-82b8-e231c00b3159/aeron_chair_adjustments_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ea0241c-a053-44bb-a927-4cd8f56e40ba/can_i_use_my_iphone_4s_in_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/onclicklistener_button_click_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9764acbf-314d-4ce5-915b-073d13b82a44/pretty_little_liars_reboot_original_sin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b8760bf-78be-4456-b2b7-d7e188029d37/what_did_george_say_before_he_killed_lennie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/862a9dae-1445-4404-92c6-b7d1ec090b67/gufuvo.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/suvixebidiberoxewufol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fb7b3c4-db42-474e-893e-bb0f95bd52d0/69523873258.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/lobapawumujosa.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_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 5056 bytes
SHA-256: 90992ffbb2a0f892cfbc61613cfb17bfe54ca1199f130742bf8050509b38fbb0
font_01_sfnt_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 10548 bytes
SHA-256: 66bfb03c2a5062c285a8a509416677792f0db636f6b7efdabf9b36c43744d866