Malicious PDF — malware analysis report

Static analysis result for SHA-256 887d0643f8eb6154…

MALICIOUS

PDF

121.3 KB Created: 2021-05-21 00:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a1fe59a30b4e77e19da154c0aa03efa0 SHA-1: 20949e0195d7a527a66de912105401087db2de86 SHA-256: 887d0643f8eb61542949f7453f98fcb2a112aa04b9456c8593b918be42a036c9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

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://gimoguvi.ru/strik?utm_term=linea+del+tiempo+de+los+procesadores+amd+e+intel PDF link annotation
    • https://fuxilidunud.weebly.com/uploads/1/3/5/3/135314653/mosubanibem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_6014d133de490.pdfIn PDF document text
    • https://visosoduvevup.weebly.com/uploads/1/3/4/2/134234588/viberotovonakul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_604714b1a085b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_603e788dbe999.pdfIn PDF document text
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/butez.pdfIn PDF document text
    • https://rofoxanubojinud.weebly.com/uploads/1/3/2/7/132740779/vezovuda.pdfIn PDF document text
    • https://tojuxumisadef.weebly.com/uploads/1/3/4/7/134714483/vamozozaval_sasilogos.pdfIn PDF document text
    • https://figinesixixe.weebly.com/uploads/1/3/3/9/133999389/dejotaketiduzuz.pdfIn PDF document text
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/8ac2afa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_601f21c16fb66.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/e2683958-2b0c-421f-91ca-06e6e6b1ce00/diary_of_a_wimpy_kid_tv_show_disney_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716b2623-458b-4602-9d99-c836187f2a35/starcraft_rv_mfg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3c281eb-58d7-440b-977a-9707c79ee988/15172144686.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/unfamiliar_words_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/861f31e2-23f2-4605-84e7-398f10b88c51/how_to_reset_brother_tn450_toner_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd8d34be-238b-4de1-a808-11c02fd28de4/24588607694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b6d3d42-ae69-4cc8-b51b-3314b9746264/char-broil_plancha_verano_200_gas-grill.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/himno_nacional_de_honduras_letra_y_explicacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ede954-2121-4d88-9840-79629c6cedbc/tl-wr841n_v14.0_openwrt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a084a9-5419-44f3-89b3-2139d980f54d/asus_tm-ac1900_aimesh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d26fbc1-80ad-45c3-bcf7-35669397a7f9/is_the_killing_still_on_netflix_uk.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_off00019a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A98 5160 bytes
SHA-256: 9ddb8c81217c95a02ae37ab8fd87dee643c8de0c4457fdf16877155d75e95b3a
font_01_sfnt_off0001ac0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC0D 13216 bytes
SHA-256: 3c42d48a887c521aacdcb7850e2d3f7417dba206d9470960442295971e8157e8