Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1c959af86b36fa…

MALICIOUS

PDF

87.3 KB Created: 2021-03-28 01:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c30ba0efeb94ca5facee786e84f85ec5 SHA-1: 194f3b53c97f9691a8ad38b428b951fa2f5154fc SHA-256: 3b1c959af86b36faf731e2810c58d17a8e0576b200aa51bb04f16e03ea1bf5f0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many of which are likely part of a link farm designed to distribute malware or conduct phishing. The primary malicious URL identified is https://botokaw.ru/wix?keyword=samsung+remote+viewfinder+apk.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=samsung+remote+viewfinder+apk
    • https://cdn-cms.f-static.net/uploads/4373519/normal_601b3677eb24b.pdf
    • https://toviwapomini.weebly.com/uploads/1/3/4/7/134727984/gawukip.pdf
    • https://cdn-cms.f-static.net/uploads/4379720/normal_5fda4975a4843.pdf
    • https://cdn-cms.f-static.net/uploads/4454042/normal_605135c3f1051.pdf
    • https://dubebonu.weebly.com/uploads/1/3/0/8/130874554/pubametexad.pdf
    • https://cdn-cms.f-static.net/uploads/4494435/normal_601180e358db4.pdf
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/pidimonurevinizu.pdf
    • https://static.s123-cdn-static.com/uploads/4482399/normal_5fcc216e90be0.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/aefa1682-3185-4eb3-a40b-89655191e539/how_to_replace_kenmore_range_hood_light_switch.pdf
    • https://uploads.strikinglycdn.com/files/19290f7c-7377-4111-a2c6-4e1c28b89ef9/what_is_the_process_of_getting_married_in_court.pdf
    • http://mebupeb.rf.gd/6037890917.pdf
    • https://uploads.strikinglycdn.com/files/de90ef50-829f-4a70-a7f7-5794e6ba2f6e/93630842344.pdf
    • https://uploads.strikinglycdn.com/files/dfca520d-780f-40b6-b6cd-316dd5edc1e8/57952436129.pdf
    • https://uploads.strikinglycdn.com/files/3f452d38-0785-4d1c-bff2-afae1e5e89dd/what_is_standard_economic_theory_mean.pdf
    • http://bipitor.epizy.com/74150110277.pdf
    • https://uploads.strikinglycdn.com/files/d7e2070d-a8e6-41fd-b9f5-8a89aff85bb7/70673300091.pdf
    • https://uploads.strikinglycdn.com/files/d8378846-3833-42bc-85c8-9407c867e402/what_are_the_5_types_of_intimacy.pdf
    • https://uploads.strikinglycdn.com/files/e9cad1c3-88b2-43ed-888e-46d0a16f9bc4/how_do_i_stop_my_first_alert_from_beeping.pdf
    • https://uploads.strikinglycdn.com/files/22de07a5-6c03-464c-9b67-e3a31dc5e4a5/60108744240.pdf
    • https://uploads.strikinglycdn.com/files/c7f46be6-1df6-4492-803a-a9dafec93673/sample_personal_essay_for_college_admission.pdf
    • https://uploads.strikinglycdn.com/files/bc2ecff6-bffa-4b25-854f-c026a91c28d9/what_is_the_best_knife_fighting_system.pdf
    • https://uploads.strikinglycdn.com/files/d6dd827a-c3d0-42bb-be67-30789ec31b64/maytag_3000_series_dryer_thermal_fuse.pdf
    • https://uploads.strikinglycdn.com/files/6107ff3e-5b63-4588-81ae-8d793c81873f/3655459081.pdf
    • https://uploads.strikinglycdn.com/files/c7561d98-8a0d-4817-a727-4421cdf12291/yin_robert_k_1994_case_study_research_design_and_methods.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001001f.bin
56f95ddceffdec77fa7a49fdf93f188e9a383a6bf574f012e4cd9774c5607d2c
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1001F 14368 bytes
font_00_sfnt_off0000ecf1.bin
93ceb8b8419421cae7d9b507a3280771347589f5d47d9e58ba5f6f97416bff3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 5648 bytes
font_02_sfnt_off000127fd.bin
9db09a45588230e08ef0c66eef169950ff461125d90f457fdad8a452d4650375
pdf-font-stream PDF embedded font (sfnt) at offset 0x127FD 12172 bytes