Malicious PDF — malware analysis report

Static analysis result for SHA-256 503513b03e12ce0a…

MALICIOUS

PDF

88.0 KB Created: 2021-03-09 06:38:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 10e2a797eb0cc5505e1f300e29e1f843 SHA-1: 137a61a676dd051693e3ec52482e53a51f13585e SHA-256: 503513b03e12ce0a8990a1fbba6ad7cf8595b24311bf1fe62d79738b8e2d4b67
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=manual+for+lg+refrigerator+lsxs26326s PDF link annotation
    • http://tanolugulutewu.medianewsonline.com/resmed_airsense_10_autoset_how_to_adjust_pressure.pdfIn PDF document text
    • http://ek-arenda.ru/francuska_gramatika1sxmr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486982/normal_5ff71a6972c94.pdfIn PDF document text
    • http://rte-ita.fun/63792700034aa5nb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411245/normal_602aa3f698058.pdfIn PDF document text
    • http://nefritthebestthing.site/world_of_guns_gun_disassembly_mod_apk69ur1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449193/normal_5ffc81cca8726.pdfIn PDF document text
    • http://fbcopyright-center.com/816984802525v2i2.pdfIn PDF document text
    • http://pemotutafid.mywebcommunity.org/what_questions_are_asked_in_a_dementia_test.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464869/normal_5fe53009d3da3.pdfIn PDF document text
    • http://love-your-lips.online/3047430132202u2w.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://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_6c28642d249341f48c439c14aa3953b6.pdf?index=trueIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_9bb2b9c0bcd84406bb661ef38052df3a.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_ef657dd8b1d64c558e6d17ebe6d5a0fc.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_29bffbce9249485ea6cc255794e7ec74.pdf?index=trueIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_23fa156488a04f3d89a3e7c7529e74ff.pdf?index=trueIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_802ebc98fcde441893db23eb18ad462d.pdf?index=trueIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_b4ee0a2081a54e24a8ffa3f9c1472021.pdf?index=trueIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_b529315133134058aad4b99dce54006b.pdf?index=trueIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_0a4e448dd51f43bc875fa296ebedf633.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_d74334cb37c245728f14442332026d17.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_off00010e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 5340 bytes
SHA-256: 2ec431db26f562f84825fdf4c74e95fb6afa7df07813744e212689b96da65685
font_01_sfnt_off00012092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12092 10460 bytes
SHA-256: 4612050c7e21e35ed0f0b85404893075a3d1220d47b8abd022e6f2fa1c2ab758
font_02_sfnt_off0001447a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333