Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d8be3a17e581f8…

MALICIOUS

PDF

61.6 KB Created: 2020-10-16 16:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8418db37c1ddaa12f737475765e06c54 SHA-1: 9c793e958e5ae99ee90b34747974f40386e43b3a SHA-256: 85d8be3a17e581f866726777fc0261d8ed242a8ce46d8df8d02d765efabdc981
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirector domains. The primary redirector URL is identified as malicious. This suggests the document is designed to lure users to malicious sites, potentially for phishing or malware distribution, under the guise of providing calibration manuals.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ttraff.club/123?keyword=2100p+turbidimeter+calibration+manual In PDF document text
    • https://gidixelasulam.weebly.com/uploads/1/3/0/7/130739099/c40014196856dd0.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/8291182.pdfIn PDF document text
    • https://podesasi.weebly.com/uploads/1/3/1/4/131437149/7506036.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/jolon_koxuzozudanik_makilitinami.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/rebodi.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/9031774.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/rozav_tapojox_wefuwolav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8da96c0-3e57-4006-92ba-993f332d68cf/47318670672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a55de321-613c-44e5-ad94-9d0175b1d8cb/zinole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44ccf8ea-70ff-49dd-84f3-1c074d2e8a67/juvab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e67722f1-40d9-4a4e-ac01-2774b0a4418c/59136265537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1250aa61-42f5-405b-b482-aa4992bb18d4/74547261061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3f65d92-f462-42ba-afed-01ea8eb089cc/gelune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9e6eea6-19b4-44a9-84e0-d60f7aa5c26b/bawofujebisamewose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1114621c-5d6e-4d87-991a-b462942557b5/80401841183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0332c496-4443-4141-b350-b34f1a5326d2/65560783198.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7057/8070/files/82125171466.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7765/4935/files/jejederuxasoremuxiverebel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6324/1632/files/adjectives_starting_with_d_to_describe_a_place.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5879/7471/files/82856505116.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9173/1649/files/60852745898.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_off0000b1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DC 5412 bytes
SHA-256: c92ccd5a9ff687325dc60504572ce4f553bb14f4ee6592b351e99c0e233cded6
font_01_sfnt_off0000c415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC415 11144 bytes
SHA-256: 5669ec1c651ef113bfa664425109d5a440d72e2f0a808c9ed7507aee2be1a71c